The B-15 iceberg in Antarctica was the largest iceberg in recorded history. Explorer Jill Heinerth wanted to see what it looked like from the inside. She assembled a team of the most accomplished divers in the world, and they traveled for 12 days through the rough waters of the Southern Ocean. Attempting to dive into cracks in the iceberg, her life was in very real danger three times. And the third time, she would be saved by an animal so small, so transparent, that you can see its heart beating right through its skin.

Jill Heinerth’s book is ⁠Into the Planet⁠.

This episode first aired in 2020.

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