A23a: Biography of an iceberg

A23a:冰山传

The Documentary Podcast

2026-09-03

28 分钟
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Forty years ago, an iceberg broke away from the Antarctic ice shelf. But this was no ordinary iceberg. A colossal chunk of ice which covered an area twice the size of London, it was as deep as the Empire State building is high and it weighed a trillion tonnes. For nearly four decades A23a was the world’s largest iceberg. Glaciologist Dr. Catherine Walker tells the story of A23a from its origins, its ice being laid down deep in the Antarctic over millennia, through to its final chapter - shrinking, melting and feeding the ocean from which it came. Catherine talks to glaciologists who study the vast cracks which propagate across the Antarctic ice shelf and to scientists who have seen A23a up close and followed its journey and its impact as it released a trillion tonnes of fresh water and nutrients into the marine environment.
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  • And there it was.

  • Just a huge block of ice, just as far as the eye could see.

  • A huge wall that extends from one horizon to the other.

  • It felt as if we were looking at land because you couldn't actually imagine how big it was.

  • It was going on for tens of kilometres in front of us.