NASA Captures Tyndall Glacier's Rapid Retreat in Southern Patagonia
An astronaut aboard the International Space Station captured images of Tyndall Glacier in southern Chile on May 10, 2026, showing ice fragments calved from its terminus floating on the expanding Lago Geikie. The glacier, part of the Southern Patagonian Icefield — the largest ice mass in the Southern Hemisphere outside Antarctica — has lost 2.2 kilometers in length since November 2022 and has been retreating since the end of the Little Ice Age roughly 150 years ago. The images highlight the ongoing acceleration of glacial retreat in Patagonia and demonstrate the value of orbital observations for monitoring remote glaciers.
On May 10, 2026, a member of the ISS Expedition 74 crew photographed Tyndall Glacier in southern Chile using a Nikon Z9 camera with a 560mm lens, capturing icebergs calved from the glacier's terminus drifting across Lago Geikie. Glaciologist Mauri Pelto of Nichols College noted that austral autumn 2026 was a period of active, if incremental, calving retreat at Tyndall and several neighboring glaciers. The glacier has shed 2.2 kilometers of length since November 2022, following roughly a decade of limited retreat but significant thinning, with a major calving event in March–April 2023 marking a turning point. Lago Geikie itself only formed around 1940 as the glacier retreated, and has been expanding ever since; a separate eastern outlet into Lago Tyndall was severed entirely by 2010 due to ice thinning. Pelto used shadow data from the ISS photograph to estimate that the glacier's ice cliff stands 30–40 meters above the lake surface. The heavily crevassed calving front produces many smaller icebergs rather than large tabular ones, and Pelto forecasts a burst of iceberg production in the coming austral fall. The glacier's retreat has also exposed ichthyosaur-bearing bedrock along its eastern edge.
Limitations & open questions
The articles do not quantify the total volume or area loss of Tyndall Glacier over its full retreat history, nor do they address how its rate of retreat compares to regional or global glacier loss averages. The role of specific climate drivers — such as changes in precipitation, sea surface temperatures, or regional warming trends — in accelerating the recent calving is not discussed.
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