Early January – At the Little Dome C site, the European Beyond EPICA project has achieved a historic milestone by successfully drilling a 2800m-long ice core, consisting of ice which is more than 1.2 million years old.[4]
Early January – The Canadian patrol vessel HMCS Margaret Brooke has departed Halifax on Operation PROJECTION 2025. This is the first-ever Antarctic visit by a Canadian military vessel.[5] The mission is supporting a team of 15 Canadian climate scientists.[6]
Late January – A Brazilian Antarctic circumnavigation expedition ended in January 2025 after covering 29,000km since November 2024.[18]
February
Early February — Researchers on board the Spanish oceanographic ship RV Sarmiento de Gamboa have observed massive columns of methane emerging from the Antarctic seabed. The CSIC vessel has been cruising the Antarctic seas for almost a month and its mission ended on February 7.[19]
6 February — The French icebreaker L'Astrolabe has returned to Hobart after its 4th rotation of the season.[20]
Late February — Japan's icebreaker Shirase has made a port call at Fremantle Harbour, Australia to reload supplies and replace personnel between its missions to Antarctica.[30] On February 26, the vessel departed for Antarctica again.[31]
The Italian icebreaker RV LauraBassi returned to the port of Lyttelton in New Zealand, concluding the 40th scientific expedition to Antarctica as part of the National Programme for Research in Antarctica (PNRA).[37]
10 March — The most detailed map yet of the landscape beneath Antarctica's ice sheet, known as Bedmap3, has been published by a team led from the British Antarctic Survey (BAS) in the journal Scientific Data.[39][40]
The Australian icebreaker RSV Nuyina has arrived near the Denman Glacier and during the following week the researchers focused on a CTD transect across the front of the Denman Glacier tongue.[44]
19 March — The 1.2-million-years-old Beyond EPICA ice samples left Antarctica aboard the Italian icebreaker RV LauraBassi.[45]
20 March — The Ukrainian icebreaker Noosfera has deployed six oceanographic Argo buoys into Antarctic waters, the first such operation for Ukraine.[46]
23 March — The Ukrainian icebreaker Noosfera left Antarctica for Punta Arenas, Chile with the departing crew of the 29th Ukrainian Antarctic Expedition and a seasonal crew on board.[49]
Late March — The snow coachIvan the Terra Bus was decommissioned after 30 years of service at the McMurdo Station, and in March 2025, it was shipped to Christchurch, New Zealand.[50]
Late March — The 11th Antarctic expedition of Colombia, counting 34 researchers from seven institutions, concluded after three months of research on the Antarctic Peninsula.[51]
Late March — NASA and NSIDC reported that in 2025, summer sea ice extent around Antarctica tied for the 2nd-lowest minimum ever recorded in the 47-year record of satellite measurements.[52][53]
3 April — Researchers aboard the RSV Nuyina reported on their collection of marine invertebrates in the vicinity of the Denman Glacier, including a pteropod which subsequently laid eggs, allowing the first direct observation of pteropod egg development.[56]
11 April — The 33rd Bulgarian Antarctic Expedition concluded when the naval research vessel Sv. Sv. Kiril i Metodii RSV 421[57] arrived in Varna after its third 5-month mission to the Southern Ocean and Antarctica.[58][59]
1 May — New Zealand announced a renewal of Government investment to extend the Antarctic Science Platform's research into Climate Change in Antarctica for another seven years.[63][64]
2 May — There was a magnitude 7.4 earthquake in the Drake Passage at 9 am local time. Chilean authorities mandated the evacuation of coastal areas in the Magallanes region and the Chilean Antarctic Territory due to tsunami threats but canceled the evacuation orders later in the afternoon after no serious damage to infrastructure or harm to people were reported.[65]
3 May — The MODIS instrument on NASA's Aqua satellite captured an image of the A-23a iceberg that has remained at a standstill less than 100 kilometers off South Georgia since early March 2025. The new image shows that the iceberg's surface area has declined substantially in preceding two months. It lost more than 360 square kilometers between 6 March and 3 May and its northern side is showing signs of edge wasting, a type of iceberg breakup where small pieces calve from many places along its edge.[66]
The Denman Marine Voyage concluded when the Australian icebreaker RSV Nuyina returned to Hobart after spending two months near the Shackleton Ice Shelf. This was the vessel's first dedicated marine science voyage.[68]
Late May — The Arête Glacier Initiative[70] was launched. This is a non-profit research organization aimed at coordinating and funding projects for better forecast and mitigation of sea-level rise caused by ice loss, especially focused on the Thwaites Glacier in West Antarctica.[71]
Late May — The Australian Antarctic Division (AAD) signed an agreement with an industry consortium to upgrade Davis research station. The works will start in November 2026 with the installation of a reverse osmosis plant and later continue with the construction of a new utilities building including the main powerhouse and various workshops.[72]
28 June — American pilot and social media influencer Ethan Guo was detained by Chilean authorities after landing without authorization at Lieutenant Rodolfo Marsh Base on King George Island.[75]
Mid-July — Six Australian expeditioners traveled 90km across the sea ice from Mawson station to Colbeck Hut to conduct the annual population census of the Taylor Glacieremperor penguin colony and to collect images captured by automated cameras monitoring the colony.[77]
2 September — Satellite observations by the European system Copernicus revealed that the A23a iceberg, now north of South Georgia, was half of its size from the beginning of 2025 and was breaking up dramatically.[81]
7 September — Ethan Guo, who has been stuck at the Chilean Lieutenant Rodolfo Marsh base on King George Island for two months after landing a plane there without permission, was released and on 6 September, he arrived in Punta Arenas aboard a navy ship.[82]
10 September — NSIDC reported that this year's Antarctic sea ice extent has already surpassed the annual maximum for the two lowest years on record (2023 and 2024), but it was is still tracking at third lowest.[83]
11 September — The MODIS instrument on NASA's Terra satellite documented the ongoing disintegration of the A23a iceberg. The iceberg spanned just over 1,500km2 and two large fragments (A23g and A23i) were visible south of it.[84]
17 September — Antarctic sea ice extent reached its annual maximum of 17.81 million km2, marking the third lowest maximum in the 47-year satellite record.[85][86]
27 September — The Australian icebreaker RSV Nuyina left Tasmania for a 52-day research and resupply voyage to Antarctica with 99 expeditioners on board,[90][91] among them Jenny Bonser, the new leader of Davis research station.[92]
1 October – At 00:47 UTC, a meter-sized near-Earth asteroid2025 TF flew about 428±7km above the surface over Antarctica. This was the second-closest asteroid flyby of the Earth ever recorded.[97][98]
3 October — Researchers at the British Antarctic Survey (BAS) in Cambridge have finished the melting process of the 190m-long ice sample from the bottom of a 2800m ice core retrieved from Little Dome C in East Antarctica during the Beyond EPICA – Oldest Ice project. This has revealed an unbroken sequence of climate cycles stretching back at least 1.2 million years—the oldest continuous ice core ever recovered.[101]
10 October — Two helicopters transported cargo and 14 people from the Australian icebreaker RSV Nuyina to Casey station. The operation took seven flights, each one a two-hour round trip. The ship was approximately 100 nautical miles from the station.[107]
14 October – The Australian Antarctic Program officially opened its recruitment campaign for the 2026/27 season, seeking about 300 workers for almost 40 different roles.[108][109]
17 October
The Ukrainian research icebreaker Noosfera departed for Antarctica from Cape Town, launching its fifth Antarctic season.[110]
17 October — The Australian icebreaker RSV Nuyina arrived at Heard Island.[114] During the visit, the icebreaker's hull has scraped the ocean floor, suffering superficial damage. No-one on the ship was injured.[115] During the following week, the ship's project groups explored the island, surveying its seabird and seal population with drone flights and in situ visits, searching for unusual levels of H5 bird flu-related mortality (found in elephant seals but no other species on the island), mapping the seafloor and investigating marine life around Atlas Cove from inflatable boats, and assessing the state of the old station at Atlas Cove. The crews also installed sea level-monitoring equipment at Magnet Point and transported eight "top hat reflectors"—ground markers for satellites—to the island for future installation.[116]
21 October — A Royal Australian Air ForceC-17A Globemaster III airdropped 600kg of ice core drilling supplies to Casey station in preparation for the Million Year Ice Core (MYIC) project summer season.[117] In total, the aircraft dropped approximately 12 tonnes of equipment to the station as part of Operation Southern Discovery 2025–26.[118] This year marked the 10th anniversary of Australian Defence Force's support to Antarctic operations.[119]
Late October — he Australian icebreaker RSV Nuyina arrived at Davis station to bring 500 tonnes of supplies.[124]
October — The 41st Italian Antarctic Research Expedition has begun with the first group of technicians arriving in Antarctica and reopening Mario Zucchelli Station, closed since previous February.[125][126]
November
1 November
China's 42nd Antarctic expedition left from Shanghai. The expedition plans to conduct the first Chinese scientific drilling into Antarctic subglacial lakes.[127]
Australian tractor-traverse team led by Damien Beloin left Casey station for a 15–18 days of travel across 1168 kilometres to the drilling site of the Million Year Ice Core (MYIC) project at Dome C North. The team is using 6 tractors and 20 sleds to haul 493 tonnes of scientific equipment, fuel, and food to the drilling site.[128]
6 November — The first group of the 34th Bulgarian Antarctic Expedition (nine logisticians and two scientists) departed by plane from Sofia to Punta Arenas.[133][134]
Mid-November — ESA-sponsored physician Nina Purvis has completed her 13-months research stay Concordia station and left the continent via Mario Zuchelli station. There she met Sarah Gaier, who was taking over her role. Later, Sarah Gaier safely arrived at Concordia. ESA reported on this exchange on 12November.[140]
12 November — The first 14 team members of the BELARE 2025-26 team arrived at the Belgian Princess Elisabeth Antarctica Research Station to open the station after it spent eight months uninhabited and controlled remotely.[141]
Early December — The Australian icebreaker RSV Nuyina left Australia for its second voyage to Antarctica this season to resupply Casey research station and again visit Heard island, this time on a 25-day science and environmental management visit (V2).[145][146]
Early December — Earth Sciences New Zealand deployed an Atmospheric Emitted Radiance Interferometer (AERI) in Antarctica to observe atmospheric infrared radiation over the following 12 months in conjunction with NASA's PREFIRE mission.[147]
Early December — A 29-strong international team set up a remote camp on the ice 700km from the nearest base (Scott Base) on the West Antarctic Ice Sheet for the third season of the SWAIS2C (Sensitivity of the West Antarctic Ice Sheet to 2°C) ice drilling project.[148][149]
The Japanese icebreaker Shirase berthed 1,700 m off Showa Station on East Ongul Island. This was several times further than on previous visits because the usual approach route was blocked by broken sea ice. The icebreaker then transferred equipment, fuel, food, and other supplies to the station.[170][171]
29 December — The Chinese icebreaker Xuelong arrived near Qinling Station to begin unloading cargo as part of China's 42nd Antarctic expedition.[172]
30 December — The Cabinet of Ministers of Ukraine decided to extend the state program of research in the Antarctic for another two years, until the end of 2027.[173][174]
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