By ShipCalculators.com · Published 8 May 2026

Antarctic Special Area and Polar Code: integrated MARPOL plus SOLAS regime

The Antarctic Special Area and Polar Code regime is the most layered geographic protection scheme in international shipping. Waters south of latitude 60° S sit simultaneously under the Antarctic Treaty 1959 and Madrid Protocol 1991, three MARPOL Special Area designations covering oil (Annex I Reg 1.11.7), garbage (Annex V Reg 1.14.5) and sewage (Annex IV Reg 1.4.5 with reservation), and the IMO Polar Code adopted by MEPC.264(68), MSC.385(94) and MSC.386(94) with mandatory effect from 1 January 2017. The result is a four-layer architecture: MARPOL discharge prohibitions, the Polar Code MARPOL Part with the Polar Water Operational Manual, the Polar Code SOLAS Part with the Polar Ship Certificate and STCW polar training endorsements, and the Antarctic Treaty system with environmental impact assessment, regional permits and IAATO industry self-regulation. Layered on top sit the HFO ban under MEPC.329(76) affecting new builds from 1 January 2024 and existing tonnage from 1 July 2029, the proposed Antarctic PSSA (Argentina 2018, still under MEPC review), and extra-territorial economic measures such as the EU ETS 50% scope for voyages into and out of Union ports. The regime affects roughly thirty expedition cruise vessels and around 100,000 visitors each austral summer, with operational anchors at Ushuaia (Argentina) and Punta Arenas (Chile). This capstone article binds the prior MARPOL articles (Reg 12, Reg 12A, Reg 14, Reg 15, Reg 17, Reg 28, Reg 33, Reg 37, Reg 41) into a single polar operational picture and links the spill-response framework under OPRC 1990 and the liability stack (CLC 1992, Bunkers Convention 2001, WRC Nairobi 2007, HNS 2010) to the polar context, alongside the MARPOL Convention parent instrument and the cruise-area parallel at Galapagos PSSA.

Contents

Background: Antarctic Treaty 1959 plus Madrid Protocol 1991

The Antarctic Treaty was opened for signature in Washington on 1 December 1959 and entered into force on 23 June 1961, fixing twelve original signatories and now numbering 56 parties of which 29 are Consultative Parties with decision-making rights. Article IV of the Treaty froze all sovereignty claims south of 60° S, Article V banned nuclear explosions and the disposal of radioactive waste, and Article VII established the inspection regime. The Treaty alone does not regulate vessel-source pollution: that gap is filled by the Protocol on Environmental Protection to the Antarctic Treaty, signed at Madrid on 4 October 1991 and in force since 14 January 1998.

The Madrid Protocol designates Antarctica as a “natural reserve, devoted to peace and science,” prohibits any activity relating to mineral resources other than scientific research (Article 7, with a minimum 50-year review window from entry into force), and contains six annexes covering environmental impact assessment, conservation of fauna and flora, waste disposal and waste management, prevention of marine pollution, area protection and management, and liability arising from environmental emergencies (Annex VI, in force from 2024 once Belarus ratified). Annex IV of the Madrid Protocol on Prevention of Marine Pollution explicitly cross-references MARPOL: Article 2 says Antarctic Treaty parties shall give effect to the relevant Annexes of MARPOL 73/78, and the Madrid Protocol does not “derogate from the specific rights and obligations” already in the IMO instrument.

The intersection between the MARPOL Convention regime and the Antarctic Treaty regime is therefore not a conflict but a deliberate stacking: IMO sets the global rules and the Special Area uplifts, the Madrid Protocol adds region-specific obligations such as the prohibition on introducing live poultry, and the Antarctic Treaty Consultative Meeting (ATCM) adopts measures binding on Consultative Parties.

MARPOL Annex I Reg 1.11.7 Antarctic Special Area for oil

The Antarctic was designated a Special Area under Annex I by IMO resolution adopted 16 November 1990 and effective 17 March 1992 in line with the early-1990s revisions to the Annex. The current consolidated text places the geographic boundary in Regulation 1.11.7: the Antarctic area means the sea area south of latitude 60° S. There is no longitudinal limit; the Antarctic Special Area is a complete latitudinal cap.

Inside the Antarctic Special Area the discharge regime under Reg 15 (machinery space discharges) is fully prohibitive: any discharge into the sea of oil or oily mixture from any ship is prohibited. The 15 ppm filter under Reg 14 does not unlock a discharge permission inside the Antarctic, although operators must still keep the equipment compliant for the rest of the voyage. Cargo-tank discharges from oil tankers, governed by Reg 34 under conventional MARPOL, are similarly prohibited; the 30 L/nautical mile rate inside cargo discharge windows is unavailable. Sludge-tank operations under Reg 12 and bilge-tank discharges have to be retained on board until the vessel exits the Special Area or reaches an adequate reception facility.

Two operational safeguards interact with the Antarctic Special Area. First, the protected fuel-oil tank arrangement under Reg 12A is mandatory for all ships with aggregate fuel-oil capacity of 600 m³ or more contracted on or after 1 August 2007: this is independent of Special Area status but particularly load-bearing in Antarctic waters because grounding probabilities are higher and shoreline response is impractical. Second, the Reg 37 Shipboard Oil Pollution Emergency Plan (SOPEP) and Reg 17 Oil Record Book Part I/II both apply with no relaxation, and the Polar Code overlay (covered below) extends the SOPEP into a Shipboard Marine Pollution Emergency Plan with polar-specific content.

MARPOL Annex V Reg 1.14.5 Antarctic Special Area for garbage

Annex V on garbage was the second Annex to designate the Antarctic. Regulation 1.14.5 of the consolidated Annex V defines the Antarctic area as the sea area south of latitude 60° S, identical to the Annex I cap. Garbage discharge into the sea is prohibited inside the Special Area for every category in Annex V Table A: plastics, dunnage, lining and packing materials, paper, rags, glass, metal, bottles, crockery, food wastes, incinerator ashes, animal carcasses, fishing gear and operational wastes are all retained on board.

Two narrow exceptions remain. Comminuted or ground food waste passable through a screen with openings no greater than 25 mm may be discharged en route at not less than 12 nautical miles from the nearest land or ice shelf in the Antarctic Special Area, but only after Annex V was tightened in 2013. Cargo-residue washwater containing residues of solid bulk cargoes that are not classified as harmful to the marine environment may be discharged only outside the Antarctic. Plastics, including synthetic ropes, fishing nets, and incinerator ash from plastic products that may contain toxic or heavy-metal residues, are absolutely prohibited inside the Antarctic Special Area without exception.

The reception facility regime under Reg 8 of Annex V applies: ports of call on the Antarctic gateway side (Ushuaia, Punta Arenas, Hobart, Bluff, Stanley) provide reception services for retained garbage, and the IMO Garbage Record Book Part I records all retentions, discharges to reception facilities, and incidental losses. In practice expedition cruise vessels operate a zero-discharge garbage policy across the entire round trip: even the comminuted-food-waste exception is rarely used because IAATO operating guidelines impose stricter retention.

MARPOL Annex IV Reg 1.4.5 Antarctic Special Area for sewage with reservation

Annex IV on sewage designates the Antarctic Special Area in Regulation 1.4.5, also at south of 60° S. The Annex IV Special Area is the youngest of the three and carries an important reservation: it does not enter into force until reception facilities along the gateway coastline are notified to IMO as adequate, and that notification has not yet been completed. Operational practice from major flag states is to apply the Annex IV Special Area regime de facto, but the legal trigger has not formally fired.

When the Annex IV Special Area becomes legally effective, sewage discharge inside the Antarctic will be prohibited unless the ship is more than 12 nautical miles from the nearest land or ice shelf and the sewage has been treated by an approved Type II Marine Sanitation Device producing effluent below 100 thermotolerant coliforms per 100 mL, 35 mg/L total suspended solids and 25 mg/L BOD5. Untreated sewage discharge in the Antarctic, even at distance and at moderate speed, will be prohibited. The Polar Code MARPOL Part already imposes a 12-nautical-mile minimum and treatment requirement on a goal-based basis, which means ship-specific Polar Water Operational Manuals already lock in something close to the prospective Annex IV Special Area regime.

The Annex IV Antarctic Special Area pending status is captured in the math:

\text{Annex IV SA in force in Antarctic} \iff \text{IMO has received adequate-RF notification}

IMO Polar Code: MEPC.264(68) plus MSC.385(94) plus MSC.386(94) effective 2017

The International Code for Ships Operating in Polar Waters (Polar Code) was adopted in two parts:

MEPC.264(68) of 15 May 2015 added the environmental Part II of the Polar Code through new MARPOL Annex I Chapter 11, Annex II Chapter 8, Annex IV Chapter 7 and Annex V Chapter 6. The amendments entered into force on 1 January 2017.
MSC.385(94) of 21 November 2014 adopted the Polar Code itself, and MSC.386(94) added a new SOLAS Chapter XIV referencing the Code. SOLAS Chapter XIV entered into force on 1 January 2017 alongside the MARPOL amendments.

A third resolution, MSC.416(97) and MSC.417(97), later amended STCW Convention and Code (Regulation V/4 and V/3 of Chapter V) introducing mandatory minimum requirements for the training and qualifications of masters and deck officers on ships operating in polar waters; these entered into force on 1 July 2018.

The Polar Code uses a goal-based structure: each chapter sets a Goal, a Functional Requirement, and Regulations. This pattern is common in modern IMO codes and is intentionally written so that flag administrations and recognised organisations can accept equivalent solutions. The Polar Code applies to ships engaged on international voyages in Antarctic and Arctic waters, with Antarctic waters defined identically to the MARPOL Special Area: south of 60° S, with no longitudinal limit.

\text{Antarctic boundary}: \phi \leq -60° \text{ (south of 60°S)}

Layer 1: MARPOL Special Area discharge prohibitions

Layer 1 is the baseline MARPOL Special Area regime described in the three sections above. The summary applicable to a typical expedition cruise vessel operating south of 60° S:

Stream	Annex	Antarctic Special Area rule
Oil from machinery space	I (Reg 15)	discharge prohibited
Oil from cargo tanks	I (Reg 34)	discharge prohibited
Oily bilge water	I (Reg 15)	discharge prohibited
Sludge from oil residue tanks	I (Reg 12)	retain to reception facility
Sewage untreated	IV (Reg 11)	retain (de facto)
Sewage treated to MSD II	IV (Reg 11)	retain (de facto, pending Annex IV SA effect)
Garbage food waste comminuted	V (Reg 6)	discharge >12 NM from land or ice shelf
Garbage non-food	V (Reg 6)	discharge prohibited
Garbage plastics	V (Reg 3)	discharge prohibited globally
Cargo residue washwater	V (Reg 6)	discharge prohibited inside SA

The companion regulations apply with no relaxation: Reg 12A protected fuel-oil tank arrangements, Reg 14 15 ppm bilge filtering equipment, Reg 17 Oil Record Book Parts I/II, Reg 28 damage stability for tankers, Reg 33 crude oil washing for crude tankers, Reg 37 SOPEP, and Reg 41 ship-to-ship transfer documentation.

Layer 2: Polar Code MARPOL Part with additional restrictions plus Polar Water Operational Manual

Layer 2 is the environmental Part II-A of the Polar Code, mandatorily applied through MARPOL. It imposes uplifts beyond the Special Area baseline:

Annex I uplift (Polar Code Chapter 1): discharge of oil or oily mixture into the sea is prohibited from any ship in polar waters; protected fuel-oil tanks under Reg 12A are extended to bunker tanks of all ships, not only those over 600 m³ aggregate, for new constructions on or after 1 January 2017 operating in polar waters.
Annex II uplift (Polar Code Chapter 2): discharge of noxious liquid substances (NLS) or mixtures containing NLS is prohibited in polar waters.
Annex IV uplift (Polar Code Chapter 4): sewage discharge subject to ice-presence rules; from category A and B ships discharge is prohibited unless the ship is operating in accordance with an approved sewage treatment plant and is en route at not less than 12 nautical miles from the nearest ice shelf or fast ice; cumulative limits apply.
Annex V uplift (Polar Code Chapter 5): discharge of food wastes onto the ice is prohibited; comminuted food waste discharge is allowed only as far as practicable from land but in no case less than 12 nautical miles from the nearest land, ice shelf or fast ice; animal carcasses cannot be discharged.

Every ship subject to the Polar Code has to carry an approved Polar Water Operational Manual (PWOM). The PWOM is the operational counterpart of the Polar Ship Certificate: it captures the assessment of the ship’s capabilities and limitations in polar waters, the procedures for normal operations and casualty avoidance, the procedures for damage control and emergency response, and the cross-references to SOPEP/SMPEP, fire safety, life-saving and bridge resource management. The PWOM is ship-specific and approved by the flag administration or RO acting on its behalf.

Layer 3: Polar Code SOLAS Part with Polar Ship Certificate plus Polar Code Crewing Standards

Layer 3 is Part I-A of the Polar Code under SOLAS Chapter XIV. It is mandatory for ships built on or after 1 January 2017 from that date, and for existing ships from the first intermediate or renewal survey after 1 January 2018. The deliverable is the Polar Ship Certificate issued for one of three categories:

Category A: ships designed for operation in polar waters in at least medium first-year ice, which may include old ice inclusions.
Category B: ships not included in Category A but designed for operation in polar waters in at least thin first-year ice, which may include old ice inclusions.
Category C: ships designed to operate in open water or in ice conditions less severe than those included in Categories A and B.

The Polar Ship Certificate contains the operational limitations (“temperature, ice conditions, high latitude”) in numeric form, together with the certificate validity, the survey schedule and the cross-reference to the PWOM.

The operational categories link to the IACS Unified Requirements UR I1, I2, I3 and IS1 polar class scale PC1 to PC7 as a structural counterpart:

PC1: year-round operation in all polar waters
PC2: year-round operation in moderate multi-year ice conditions
PC3: year-round operation in second-year ice with multi-year ice inclusions
PC4: year-round operation in thick first-year ice with old-ice inclusions
PC5: year-round operation in medium first-year ice with old-ice inclusions
PC6: summer/autumn operation in medium first-year ice with old-ice inclusions
PC7: summer/autumn operation in thin first-year ice with old-ice inclusions

The Polar Code Operational Limitations Categories (A, B, C) are not the same scale as the PC notations but the two interlock through the POLARIS (Polar Operational Limit Assessment Risk Indexing System) methodology, which translates ice conditions into a Risk Index Outcome (RIO) for any given ship. Vessels with PC1 to PC5 typically carry Category A certification, PC6 to PC7 carry Category B, and ice-strengthened or non-ice-class hulls carry Category C with operating restrictions to open water or first-year ice patches.

The crewing layer comes from the STCW Regulation V/4 and the STCW Code Section A-V/4: masters, chief mates and officers in charge of a navigational watch on ships operating in polar waters must hold a polar-waters Basic or Advanced training certificate. Basic training requires familiarity with ice characteristics, ice navigation, ship behaviour in cold and ice, and the legal regime; Advanced adds incident management and emergency response. The training requirement applies to Category A and B ships from 2018; for Category C ships only the master and chief mate need basic training.

Layer 4: Antarctic Treaty regime with environmental impact assessment and IAATO self-regulation

Layer 4 is the Antarctic Treaty system overlay. Under the Madrid Protocol Annex I every activity in the Antarctic, including tour operations and resupply voyages, is subject to a tiered environmental impact assessment:

Preliminary assessment for activities expected to have less than minor or transitory impact;
Initial Environmental Evaluation (IEE) for activities expected to have minor or transitory impact;
Comprehensive Environmental Evaluation (CEE) for activities expected to have more than minor or transitory impact.

A CEE is reviewed by the Committee for Environmental Protection (CEP) and is binding on the proposing party. The Annex I procedure has been used for ice-breaker port calls, runway construction at the Italian Mario Zucchelli Station, the British Halley VI station relocation in 2017, and most cruise concession proposals.

IAATO, the International Association of Antarctica Tour Operators, was founded in 1991 by seven operators. By the 2024-2025 austral season it had over 110 member operators and field operators. IAATO field-operating procedures are stricter than the ATCM measures in many respects: the passenger cap rules limit landings to 100 passengers ashore at any one time at any single landing site, restrict any vessel carrying more than 500 passengers from landing at all (de facto Category A vs B/C/D vessel split), and impose a 20:1 passenger to staff ratio. The Antarctic Site Guidelines for over 40 of the most-visited landing sites cap visitor numbers, define landing zones, and identify wildlife approach distances. IAATO operators are required to operate ships ice-classed to at least IACS Polar Class PC7 or equivalent for visits to the Antarctic Peninsula in austral summer.

IAATO and the cruise/expedition fleet

The Antarctic cruise and expedition fleet has grown from a single vessel in the late 1960s (the Lindblad-chartered MS Lapataia) to a steady-state fleet of about 30 to 40 hulls operating in the austral summer between November and March. Visitor numbers crossed 100,000 for the first time in the 2022-2023 season after the COVID rebound and are projected to stabilise around 120,000 by the late 2020s, contingent on IAATO’s voluntary cap discussions and the Antarctic Treaty Consultative Meeting position on tourism management.

The fleet splits broadly:

Category 1 (small expedition) vessels with under 200 passengers and ice-class PC6/PC7: Hurtigruten MS Fram and Roald Amundsen, Lindblad National Geographic Endurance and Resolution, Aurora Expeditions Greg Mortimer and Sylvia Earle, Quark Expeditions Ultramarine, Ponant Le Commandant Charcot (PC2, the most capable expedition cruise hull as of 2026), Scenic Eclipse, Seabourn Venture and Pursuit.
Category 2 (mid expedition) vessels with 200-500 passengers and ice-class PC6: Silversea Silver Endeavour, Viking Octantis and Polaris.
Category 3 (large cruise, no landings) vessels above 500 passengers: only “scenic cruising” trips with no Zodiac landings, such as Holland America Westerdam scenic transit voyages.

The annual operational cost per expedition cruise hull in Antarctic waters runs USD 8 million to USD 15 million for a 4-month season after fuel, port dues, IAATO dues, ice pilots, and insurance.

Polar Code Operational Limitations Categories A/B/C and PC1 to PC7 ice-class

Polar Code Categories A, B, C are operational and assigned in the Polar Ship Certificate. The PC notations are structural class notations issued by IACS member societies. The relationship is captured as:

Polar Cat	IACS PC range	Antarctic peninsula access	Ross Sea / deep ice access
A	PC1-PC5	yes year-round	yes summer; PC1-PC3 year-round
B	PC6-PC7	yes summer	summer only with caveats
C	non-ice or ICE-1A Super	open water/first-year only	not recommended

POLARIS converts ice-condition data into a Risk Index Outcome:

\text{RIO} = \sum_{i} \text{(ice type fraction)}_i \cdot \text{RIV}(i, \text{ship class})

where RIV is the Risk Index Value tabulated in MSC.1/Circ.1519. Positive RIO means normal operation; RIO between 0 and -10 means elevated risk operation; RIO below -10 means operation should not proceed.

SOLAS Chapter XIV cross-reference

SOLAS Chapter XIV is short by SOLAS standards: four regulations (Definitions, Application, Requirements for ships operating in polar waters, Alternative design and arrangements). The substance is delegated to the Polar Code. The chapter applies to ships operating in polar waters of either pole and the application clause carries the standard SOLAS construction-vs-operation split: new construction from 1 January 2017, existing ships from the first intermediate or renewal survey after 1 January 2018, and category C ships of less than 500 GT and pleasure yachts of less than 300 GT not engaged in trade are exempted.

Antarctic PSSA proposal (Argentina 2018) and the MEPC review

Argentina submitted a Particularly Sensitive Sea Area (PSSA) proposal at MEPC 72 (April 2018) covering the Antarctic Peninsula and adjacent waters. The PSSA framework under resolution A.982(24) requires identification of ecological, social/cultural, and scientific criteria together with at least one Associated Protective Measure (APM). The Argentine submission identified the Antarctic Peninsula’s role as a climate sentinel, the IBA (Important Bird Area) network, the cetacean concentrations including the recovering humpback population, and the cumulative pressure from cruise tourism.

The proposal has not yet been designated. MEPC has discussed it across several sessions and the principal delays relate to: (1) the overlap with the Antarctic Treaty system and whether IMO is the appropriate forum for an APM that the Treaty already addresses through the IAATO regime; (2) the question of which APMs would add to the Polar Code uplift; and (3) the position of non-Treaty IMO members. The 2024-2026 work plan at MEPC includes the PSSA proposal as a standing item. If designated, the Antarctic PSSA would join the Galapagos PSSA, the Great Barrier Reef PSSA, and the other current PSSAs, and would in principle be coterminous with the MARPOL Annex I/IV/V Special Area boundaries.

HFO ban: MEPC.329(76) for 2024 new builds and 2029 existing tonnage

The carriage and use of heavy fuel oil (HFO) as fuel in Antarctic waters has been prohibited since 1 August 2011 under MARPOL Annex I Reg 43, including the carriage in bulk as cargo. This 2011 ban was Antarctic-specific. The Arctic equivalent came later, under MEPC.329(76) of 17 June 2021, which added a new Reg 43A applying the HFO ban in Arctic waters (with phase-in dates):

\text{HFO ban (MEPC.329(76))}: \begin{cases} \text{new builds} & \geq 1 \text{ Jan 2024} \\ \text{existing tonnage} & \geq 1 \text{ Jul 2029} \end{cases}

The Antarctic ban has no waivers or exemptions under Reg 43, so the 2024/2029 split is an Arctic feature. In practice the Antarctic HFO ban is total, and operators bunker MGO/MDO at Ushuaia or Punta Arenas before crossing the Drake Passage. Cruise lines reported retrofit costs of USD 3 million to USD 8 million per vessel for HFO-to-MGO conversion when adapting Arctic-pattern hulls for Antarctic operation, primarily due to fuel-tank cleaning, pump replacement, and updated bunker delivery infrastructure.

LNG bunkering at Ushuaia and the polar bunker chain

Ushuaia (54°48′ S) is the southernmost commercial port in the world and the dominant gateway to the Antarctic Peninsula, accounting for around 90% of seaborne tourism flows. Ushuaia is a Free Trade Zone, has a 350 m main pier with 9.5 m alongside depth, and supplies MGO bunkers from YPF’s Río Grande refinery via coastal tanker. Punta Arenas (53°10′ S) supplies the secondary route and a small share of Falkland-Islands-based traffic.

LNG bunkering for Antarctic-bound vessels is not yet operational at Ushuaia: the absence of a small-scale liquefaction or import terminal means LNG-fuelled expedition vessels (Le Commandant Charcot, Roald Amundsen and Fram from 2024) bunker LNG at European ports before repositioning. Argentina announced a small-scale LNG truck-to-ship pilot at Ushuaia in 2024 with first delivery targeted for late 2026. Until that pilot becomes operational LNG-fuelled hulls operate in Antarctic waters on stored bunkers and use marine diesel as the back-up.

Comparison with the Arctic regime above 60° N

The Polar Code applies symmetrically in the Arctic and the Antarctic with one important asymmetry: MARPOL Special Area designations differ.

Annex	Antarctic SA	Arctic SA
I (oil)	Yes (1992)	No (Polar Code uplift only)
II (NLS)	No (Polar Code uplift only)	No (Polar Code uplift only)
IV (sewage)	Yes (pending RF notification)	No
V (garbage)	Yes (1992)	No
VI (air)	No, but EU ETS extra-territorial 50%	No, but ECA proposed 2024 not adopted
HFO ban	Reg 43 from 2011	Reg 43A from 2024/2029

The Arctic does not have a MARPOL Special Area designation under any Annex. The Polar Code uplift in Annex I, II, IV and V is the sole layer-2 protection. The asymmetry reflects the political-geographic difference: the Arctic is bounded by sovereign states and the Polar Code uplift is calibrated against their regulatory regimes (notably the U.S. and Russian regimes), whereas the Antarctic is a no-sovereignty common where the Special Area provides the floor that no flag administration can adjust unilaterally.

Polar Code goal-based approach

The Polar Code uses a goal-based structure rather than a prescriptive checklist. Each chapter contains:

Goal: the overall environmental or safety outcome (e.g., “to provide effective and timely measures to prevent and respond to pollution incidents”).
Functional Requirement(s): the operational outcomes the ship has to achieve.
Regulations: the specific deliverables, including documented procedures and equipment.

The advantage is flexibility: a ship can demonstrate compliance with the Functional Requirement using any equipment or procedure accepted by the flag administration. The risk is asymmetric implementation: small flag administrations sometimes interpret functional requirements at the lower bound, and the IMO Sub-Committee on Ship Design and Construction (SDC) has had to issue interpretive guidance on damage control, lifeboat freezing, and survival craft launching from ice-shelf-proximate locations.

The goal-based approach also permits alternative design and arrangements under SOLAS XIV/4: any deviation from the prescriptive solution has to be justified by an engineering risk assessment and approved by the flag administration. This is the route taken by Le Commandant Charcot’s hybrid LNG-electric propulsion arrangement and by Hurtigruten’s hybrid-battery installation on Roald Amundsen.

Interaction with EU ETS extra-territorial 50% scope

The European Union Emissions Trading System (EU ETS) maritime extension under Directive 2003/87/EC as amended in 2023 brings shipping into the cap-and-trade scheme from 1 January 2024. The scope is extra-territorial: 100% of emissions on intra-EU voyages and 50% of emissions on extra-EU voyages that begin or end at an EU port. An Antarctic expedition cruise voyage operated by a Hamburg-based or Genoa-based operator therefore generates EU ETS exposure on the entire repositioning leg from Europe to South America, plus 50% of the round trip from Ushuaia/Punta Arenas if the ship returns to a Union port.

Operators have responded by:

Routing through non-EU gateway ports (Buenos Aires, Punta Arenas) and treating the Drake Passage segment as a non-EU-gateway operation;
Buying EU Allowances (EUAs) to cover the 50%/100% scope;
Switching to LNG, biofuel or methanol to reduce the EU ETS exposure given that allowance prices in the late-2025 market run between EUR 60 and EUR 90 per tonne CO2e.

The interaction with the IMO Net-Zero Framework and the prospective Annex VI global GHG fuel intensity regime is currently double-counted: an EU port-call voyage will face both EU ETS and IMO Net-Zero charges from 2027 unless one regime is amended. Antarctic cruise itineraries are particularly sensitive because the small fleet has high per-voyage emissions and limited substitution options.

Comparison with Galapagos PSSA cruise restrictions

The Galapagos PSSA was designated by IMO Resolution MEPC.135(53) in 2005, expanded by MEPC.229(65) in 2013, and is the closest analogue to the proposed Antarctic PSSA. Both are ecologically sensitive, both rely heavily on cruise tourism, and both depend on a national park authority operating an Associated Protective Measure regime. The differences are instructive:

Feature	Galapagos PSSA	Antarctic (proposed) PSSA
Sovereignty	Ecuador territorial sea + EEZ	no sovereignty (Treaty system)
Cruise cap	116 vessel licences (2026)	de facto IAATO ~30-40 hulls
HFO regime	Ecuador national (no IMO HFO ban)	IMO Reg 43 ban from 2011
Reception facilities	Baltra and San Cristobal	Ushuaia and gateway ports
Ice class	not required	PC6/PC7 minimum (IAATO)
Sewage	Galapagos national park rules	MARPOL IV uplift via Polar Code

The Antarctic case does not require a national park authority to enforce because the IAATO industry self-regulation occupies the same operational role.

Historical incidents: Bahia Paraiso 1989, Explorer 2007, Akademik Ioffe 2018

Three incidents anchor the modern Antarctic regulatory framework.

MV Bahia Paraiso (Argentine ice-class supply/cruise vessel, 1989). On 28 January 1989 the Bahia Paraiso ran aground 2 miles off Anvers Island near Palmer Station carrying 81 cruise passengers and 235 crew. The ship listed and sank within four days, releasing approximately 600,000 litres of diesel and gas oil into the surrounding waters: the largest oil release in Antarctic history at the time. The Bahia Paraiso incident drove the early-1990s push for the Annex I Special Area designation and for stronger structural standards on Antarctic-going hulls. The wreck remains in place as of 2026, although most of the fuel was recovered or weathered within five years.

MS Explorer (Canadian-flagged, ice-class 1A, 2007). On 23 November 2007 the Explorer struck submerged ice in the Bransfield Strait, took on water, and sank in ~600 m of water with 154 passengers and crew aboard. All souls were rescued by sister vessel Nordnorge in calm conditions; the loss became a textbook case for ice damage to single-skin ice-class hulls and led directly to the 2008 Council on Foreign Relations Polar Shipping Code drafting work that became the IMO Polar Code in 2017. Reg 12A protected fuel-oil tank arrangements in the Antarctic environment trace partly to this incident.

MV Akademik Ioffe (Russian-flagged research/cruise charter, 2018). On 24 August 2018 the Akademik Ioffe grounded in the Gulf of Boothia in the Canadian Arctic (not the Antarctic, but operationally linked to the same fleet). Subsequent TSB Canada investigation found inadequate passage planning and a charter operator with limited polar expertise; the vessel was refloated with no fatalities but the incident reinforced IAATO’s tightening of charter-operator due diligence in 2019-2020.

2024-2026 hydrogen/electric Antarctic cruise pilots

The post-2024 decarbonisation pilots in the Antarctic cruise and expedition fleet include:

Hurtigruten Roald Amundsen (PC6, hybrid LNG-battery, in Antarctic service since 2019) targeting zero-emission Antarctic operation in port and at low-speed ice-edge transit from 2026 with extended battery sets.
Hurtigruten Sea Zero concept (announced 2023, target delivery 2030) for an all-electric coastal cruise hull with retractable wing sails; intended primarily for Norwegian coastal service but with a polar variant under design study.
Color Magic Hydrogen and Norled Norwegian fjord pilot for green hydrogen propulsion: not yet polar-rated but the fuel cell stack technology is under polar-cold-temperature qualification.
Ponant Le Commandant Charcot (PC2 hybrid LNG-battery) operating on a “polar-light” energy mix with a dynamic positioning electric mode for sensitive landings.
Quark Expeditions Ultramarine (PC6) running on MGO with hybrid battery support for hotel load.

The Argentine Antarctic Programme and the British Antarctic Survey both operate research vessels (RRS Sir David Attenborough, ARA Almirante Irízar) that participate in Polar Code surveillance and provide pollution-response support to commercial operators. The post-2026 trajectory is clearly toward lower-carbon and lower-particulate Antarctic operation, but the goal-based Polar Code is not yet calibrated against zero-emission propulsion systems and the next round of MEPC amendments will likely tighten alternative-fuel approval routes.

Formula, assumptions, and limits

Formula

The Antarctic regime is captured by three first-order conditions:

\text{Antarctic boundary}: \phi \leq -60°

\text{Polar Cat}: \text{Cat} = f(T_{\text{operational design}},\ \text{ice presence},\ \text{ice-class})

\text{HFO ban}_{\text{Antarctic}}: \forall t \geq 1 \text{ Aug 2011},\ \text{HFO carried as fuel or cargo} = 0

Derivation

The latitudinal cap of 60° S is the southern boundary of the Antarctic Treaty under Article VI. The same line is adopted by MARPOL Annex I (Reg 1.11.7), Annex IV (Reg 1.4.5), Annex V (Reg 1.14.5), and the Polar Code: the regime is therefore continuous and not discretised by sub-areas as in the Mediterranean or the Baltic. The Polar Category function derives from the Polar Code Chapter 1.2 definitions: Category A allows operation in medium first-year ice, Category B in thin first-year ice, Category C in open water or less severe ice. The HFO ban derivation traces to Annex I Reg 43 as adopted by MEPC.189(60) in 2010 and effective 1 August 2011 with no phase-in.

Assumptions

Latitudinal cap is the operative boundary; longitudinal restriction is absent.
The four regulatory layers (MARPOL SA, Polar Code MARPOL Part, Polar Code SOLAS Part, Antarctic Treaty system) operate concurrently and the strictest rule prevails at any moment.
Ship-specific operational limits flow from the PWOM and are not negotiable in service.
IAATO membership is functionally a precondition for commercial cruise operation south of 60° S even though it is not a legal requirement.
The Annex IV Antarctic Special Area is treated as de facto effective by major flag administrations even though the formal trigger (RF notification) has not fired.

Worked example

Vessel A is a 130 m PC6 expedition cruise hull built 2018, registered in Norway, carrying 200 passengers and 100 crew, contracted for a 14-day round trip Ushuaia-Antarctic Peninsula-Ushuaia in February 2026. Compliance picture:

Layer 1: zero discharge of oil, garbage other than comminuted food waste >12 NM, and (de facto) sewage. Oil Record Book Part I and Garbage Record Book updated daily.
Layer 2: PWOM approved by DNV (RO for Norwegian flag); SMPEP carried; Annex II zero NLS discharge applies trivially since the hull does not carry NLS cargo.
Layer 3: Polar Ship Certificate Category B; master and chief mate hold Advanced Polar Training under STCW V/4; second mate and OOW hold Basic Polar Training.
Layer 4: IEE filed with Norwegian Polar Institute and lodged with ATCM; IAATO field operating procedures govern landings; voluntary 100-passengers-ashore cap respected.
HFO: ship bunkers MGO at Ushuaia; HFO carriage as cargo not applicable (no cargo space).
EU ETS: 50% of return repositioning leg Genoa-Ushuaia and Ushuaia-Genoa is in scope; round-trip Ushuaia-Antarctica-Ushuaia is treated as extra-EU and out of scope.

Annual EU ETS allowance cost for Vessel A in 2026 budgeted at EUR 1.2 million on assumed 18,000 tCO2e and EUR 75/t allowance price on the in-scope segments.

Edge cases and limits

Pleasure yachts under 300 GT are out of scope of SOLAS Chapter XIV but inside the MARPOL Special Area regime; about 5-10 yachts per season operate in the Antarctic and IAATO has a separate yacht working group.
Distress and force majeure override discharge prohibitions under all Annexes (e.g., MARPOL I Reg 4.1) but require Oil Record Book entries and immediate flag-state notification.
Sewage from Category B/C ships under the Polar Code Chapter 4 Part II permits discharge of comminuted and disinfected sewage closer than 12 NM only in dire circumstances; the practical default is total retention.
Reception facilities at Ushuaia and Punta Arenas are characterised as adequate by Argentina and Chile but the IMO notification under Annex IV Reg 12bis has not been formalised, which is the structural reason the Annex IV Special Area is not yet legally in force.
Wreck removal under WRC Nairobi 2007 does not apply to Antarctic waters because no Antarctic state has territorial waters there in the WRC sense; wreck management falls back to the Madrid Protocol Annex IV and to flag-state insurance.
Liability under CLC 1992, the Bunkers Convention 2001, and HNS 2010 operates by reference to the flag of the polluting ship; recovery of cleanup costs in the Antarctic faces practical jurisdiction issues, which is why insurers typically require IAATO-grade operating procedures plus enhanced P&I cover for polar voyages.

Regulatory basis

Antarctic Treaty 1959 Articles I-VII; Madrid Protocol 1991 Articles 1-12 and Annexes I-VI.
MARPOL Annex I Regs 1.11.7, 4, 12, 12A, 14, 15, 17, 28, 33, 37, 41, 43; Annex IV Regs 1.4.5, 11, 12bis; Annex V Regs 1.14.5, 3, 6, 8.
Polar Code Parts I-A and II-A under MEPC.264(68), MSC.385(94) and MSC.386(94); SOLAS Chapter XIV; STCW Reg V/4 and Section A-V/4 under MSC.416(97).
OPRC 1990 under resolution OPRC for incident-response capacity.
MEPC.329(76) for Arctic HFO ban (Antarctic counterpart already in Reg 43 from 2011).
EU Directive 2003/87/EC as amended 2023 for EU ETS maritime extension.

Common errors

Treating the Polar Code as a SOLAS-only instrument and missing the MARPOL Part II-A obligations.
Confusing Polar Categories A/B/C (operational) with PC notations (structural); the two are linked through POLARIS but are separate certificates.
Assuming the Annex IV Antarctic Special Area is in force; it is not, pending the RF notification.
Treating the HFO ban as 2024-onwards; in the Antarctic the ban has been in force since 2011, with the 2024/2029 phase-in applying only to the Arctic.
Forgetting that the goal-based approach allows alternative design and arrangements but requires an engineering risk assessment and flag-state approval.
Overlooking IAATO’s 100-passengers-ashore and 500-passenger-no-landing rules; these are operational constraints with commercial significance even though they are not IMO instruments.
Misreading the EU ETS scope: the 50% rule applies to extra-EU voyages, and the Drake Passage round-trip from Ushuaia is not an EU voyage at all unless the operator routes through an EU port.