Record-Breaking Antarctic Drill Unlocks Twenty-Three Million Years of Climate History

Deepest Core Ever Retrieved From Beneath an Ice Sheet

An international team of scientists has achieved a landmark feat in climate research by drilling a two hundred and twenty-eight metre sediment core from beneath the West Antarctic Ice Sheet, shattering previous records by a factor of more than twenty. The core, composed of ancient mud, gravel, and rock, was extracted at Crary Ice Rise on the edge of the Ross Ice Shelf, some seven hundred kilometres from the nearest Antarctic research stations.

Twenty-Three Million Years in a Tube of Mud

Initial analysis suggests the layers of sediment span roughly twenty-three million years of Earth's climate history, including periods when global average temperatures were significantly higher than two degrees Celsius above pre-industrial levels. Shell fragments and the remains of marine organisms that require sunlight to survive were found within the core, providing the first direct evidence that this region was once open, ice-free ocean.

A Hard-Won Scientific Triumph

The achievement was the result of three Antarctic seasons of effort by the SWAIS2C project, short for Sensitivity of the West Antarctic Ice Sheet to Two Degrees Celsius. A team of twenty-nine scientists, drillers, engineers, and polar specialists spent nearly ten weeks at a remote camp, working around the clock. They first used a hot-water drill to bore through five hundred and twenty-three metres of ice before lowering more than one thousand three hundred metres of pipe to reach bedrock.

Why It Matters for the Future

The West Antarctic Ice Sheet holds enough frozen water to raise global sea levels by four to five metres if it melts completely. Understanding how this ice sheet responded to past warm periods is critical for predicting future sea level rise and its impact on coastal communities worldwide. The core samples have been transported to New Zealand and will be distributed to researchers across ten countries for detailed analysis.