| IMO | 9992713 |
|---|---|
| Gross tonnage | 8,500 GT |
| Length | 104.4 m |
| Beam | 18.4 m |
| Passenger capacity (double) | 154 |
| Passenger capacity (max) | 200 |
| Crew | 100 |
| Service speed | 15.5 knots |
| Builder | China Merchants Heavy Industry |
| Yard | Haimen |
| Launched | 2025 |
| Maiden voyage | 2025 |
| Class | Infinity-class cruise ship |
| Operator | Aurora Expeditions |
| Status | Active |
| All names | Douglas Mawson; Ocean Discoverer |
Overview
Douglas Mawson is a polar expedition cruise ship built for SunStone Maritime Group and placed on long-term charter to Australia's Aurora Expeditions. Delivered at China Merchants Heavy Industry's Haimen yard on 9 September 2025, she is the seventh and final ship of SunStone's Infinity class and the third of the class to sail for Aurora, after Greg Mortimer and Sylvia Earle. Her inaugural voyage followed in December 2025.
She is named for Sir Douglas Mawson (1882–1958), the Australian geologist whose Antarctic work made him one of the central figures of the Heroic Age of Antarctic exploration. The name continues Aurora's practice of naming its ships for pioneers — an explorer, and an environmentalist in Sylvia Earle's case — and it was chosen, the line said, to mark Aurora's return to East Antarctica, Mawson's own ground. As the last of a seven-ship series, she also closes one of the defining expedition-ship building programmes of the 2020s.
Key specifications
The dataset records Douglas Mawson at 8,500 GT, 104.4 metres long and 18.4 metres in beam, carrying 154 passengers at double occupancy and 200 at maximum, with a crew of 100 and a service speed of 15.5 knots. Delivery reporting gives slightly different working figures — up to 170 passengers and 102 crew, a draught of 5.3 metres, Ice Class 1A and Polar Class 6 certification — and those variants are logged in the batch notes rather than blended into the table above. The dataset's 8,500 GT is this hull's figure; the roughly 7,400 GT often quoted for the Infinity class is a class standard, not this ship's registered tonnage.
The polar certifications are the specification that matters most. Polar Class 6 and Ice Class 1A qualify the ship for summer and autumn operation in medium first-year ice, which is what makes year-round switching between polar and warm-water expedition work possible for a hull of barely a hundred metres.
Design and construction
The Infinity class is an international product: naval architecture by Ulstein in Norway, interior design by Tomas Tillberg Design in the United States, interior outfitting by Mäkinen of Finland, and construction by China Merchants Heavy Industry at Haimen. Its signature is Ulstein's X-BOW, the inverted bow form intended to cut through waves rather than ride over them, improving comfort, speed retention and fuel efficiency in head seas — a quality that matters disproportionately on long Southern Ocean crossings.
Douglas Mawson was built as SunStone's seventh Infinity unit. The project had an interrupted history: the hull was originally planned under the name Ocean Discoverer, was at one stage reported cancelled in 2022, and was then reinstated, with steel cutting on 12 December 2023. She was launched at Haimen at the end of November / beginning of December 2024 and completed sea trials in July 2025, with Ulstein reporting that all test items were passed. Tier III engines with selective catalytic reduction, low-sulphur marine gas oil fuel, waste-heat recovery, dynamic positioning (virtual anchoring, avoiding anchor damage to seabeds), zero-speed stabilisers and Safe Return to Port compliance complete a specification written around environmental sensitivity and self-reliance in remote water. Ulstein also notes the ship is prepared for later methanol conversion and possible battery fit.
Naming, launch and maiden voyage
Unlike her fleetmates, Douglas Mawson was not given her name at the slipway. The seventh Infinity hull was contracted and built under the project name Ocean Discoverer — the name that still appears alongside hers in the dataset's name history — originally with other charterers in view. When the ship was confirmed for Aurora Expeditions, she took the name of the Australian explorer instead, announced by Aurora in April 2024.
The launch took place at Haimen in late 2024, reported as 29 November by CruiseMapper and as early December in the yard's delivery coverage. Delivery followed on 9 September 2025. Her inaugural voyage came in December 2025: after a shakedown sailing, Aurora sent her south on a "Mawson's Antarctica" voyage, deliberately retracing the geography of her namesake's expeditions for her first passenger season.
Career by operator
| Period | Name | Operator |
|---|---|---|
| Project stage | Ocean Discoverer (planned name, never entered service under it) | SunStone Maritime Group (owner) |
| 2025–present | Douglas Mawson | Aurora Expeditions (long-term charter from SunStone) |
The hull has never traded under another operator. The Ocean Discoverer entry in her name history is a project name from the order stage, not a previous career — the distinction matters, because several of her sisters were contracted in the same speculative way before charterers were fixed.
Onboard character
The Infinity class's era-defining idea is that a 150-passenger ship can be a proper polar vessel rather than a converted one: ice-classed, stabilised, dynamically positioned, and designed from the keel up around getting people ashore by Zodiac in difficult places. Aurora's three ships share fleet-specific touches reported for the class's later units — large bow windows and a bow lounge, an inside/outside top-deck restaurant, and a dive centre unique within the class to Aurora's ships.
For Douglas Mawson specifically, Aurora introduced single-berth cabins, a first for the line, aimed at solo travellers. The rest of the character is the class formula: lecture theatre and science centre for the expedition programme, mudrooms for gear, generous observation space, and hotel comfort kept deliberately secondary to the operation outside the windows. That hierarchy — ship as base camp, not destination — is what the Infinity design standardised across seven hulls and multiple charterers.
Major refits and incidents
None. The ship was delivered in September 2025 and began passenger service in December 2025; no refit, grounding, fire or other notable incident involving Douglas Mawson has been reported in the sources consulted at the time of writing.
Sister ships and class
Douglas Mawson completes the seven-ship Infinity class built by China Merchants Heavy Industry for SunStone: Greg Mortimer (2019), Ocean Explorer (2021), Ocean Victory (2021), Sylvia Earle (2022), Ocean Odyssey (2022), Ocean Albatros (2023) and Douglas Mawson (2025). All seven share the Ulstein X-BOW design, adapted in interior arrangement to each charterer. Three of the seven — Greg Mortimer, Sylvia Earle and Douglas Mawson — sail for Aurora Expeditions, making Aurora the class's largest single operator. SunStone presented the seventh delivery as the completion of this first Infinity series.
Fate and where she is now
Douglas Mawson is active, owned by SunStone Maritime Group and in service on long-term charter to Aurora Expeditions, for whom she began sailing in December 2025. There is no onward fate to record; she is the newest hull in her class and at the start of her career.
Sources: https://www.cruisemapper.com/ships/Douglas-Mawson-2177, https://www.marinelink.com/news/sunstone-expedition-cruise-vessel-529775, https://www.cruiseandferry.net/articles/aurora-expeditions-takes-delivery-of-infinity-class-ship-douglas-mawson, https://ulstein.com/news/successful-sea-trial-of-the-douglas-mawson