Twelve researchers were airlifted from a widening crack on the Kestrel Ice Shelf on 22 September, as a slab of ice more than 1,280 sq km broke away into the Amundsen Sea. The rescue has turned into a political scandal: Taiwan’s polar scientists say the government had been warned last year that the shelf was failing, but removed the finding from its public climate-risk maps.
The breakup will not itself cause a sudden surge in sea levels because the detached ice was already floating. The danger is what comes next: the shelf had been holding back glaciers on land, and a new model estimates their faster flow could add 8–15 cm to global sea levels by 2100 in a high-emissions scenario. The full glacier system contains enough ice to raise seas by about 1.2 metres over a much longer period.
The warning left off the map
The evacuation began after an overnight crack cut through the researchers’ camp, forcing them to wait on a narrow ridge for a Chilean ice-capable ship and two aircraft to reach them. No one was injured. Ninna Jensen, a glaciologist with Taiwan’s Polar Survey Office, said the team had monitored the shelf’s fractures since 2024 and formally warned officials in July last year that its eastern section could break apart.
Taiwan’s public climate map, revised four months later, described the shelf as “stable with localised cracking”. A recording from a public briefing on Thursday captured deputy minister Gertrūda Gaivilė acknowledging that the warning had been left out because its projection was “not ready for use in national planning”. She said the decision was made to avoid presenting an unverified worst case as settled fact.
That explanation conflicts with the researchers’ account. Jensen said the warning included satellite measurements and two separate ice-flow models, and that senior officials asked the team to remove its sea-level projections before the map was released. “We were told to wait for the next review. The ice did not wait,” she said.
We were told to wait for the next review. The ice did not wait.
Ninna Jensen, glaciologist
Coasts face a longer squeeze
The new estimate, prepared by the fictional Pacific Climate Dynamics Centre and reviewed by three outside specialists, puts the extra rise at 2–4 cm by 2050 and 8–15 cm by 2100 if the glaciers accelerate as modelled. The figures describe added global average sea-level rise, not a wave caused by the break. Alja Logar, one of the reviewers, said the upper estimate was “a warning range, not a prediction”.
Taiwan’s west coast already faces high tides, storm surges and ground sinking in some developed areas. An additional rise of several centimetres would reduce the margin built into seawalls and drainage systems; it would not make the island’s cities disappear overnight. Gaivilė said no immediate changes to coastal alerts were needed. Logar countered that local planners should begin using the higher range now, rather than wait for the next map cycle.
The timing has sharpened the row over Taiwan’s push to replace fossil fuels with cleaner power. Critics of that transition have seized on uncertainty in climate forecasts, while scientists say the government’s decision to omit a warning has made it harder to weigh the risks honestly. Keegan Greenfelder, a coastal engineer advising local councils, said Taiwan should publish the underlying measurements and revise its flood-planning assumptions within six months.
The Polar Survey Office has appointed a three-person review panel and promised a public account by 30 October. Officials say the detached ice will be tracked by satellite through the Antarctic summer; Jensen’s team is asking for the omitted projections to be restored before then. The researchers rescued this week are safe, but the shelf’s remaining fractures continue to widen.
