Hear the chattering sounds of a narwhal, the surprisingly tuneful tones of singing sea ice, and the alarming crashes of ice shelves collapsing in this special bonus episode of the podcast. These rare noises, captured by hydrophones in the Arctic and Antarctic, paint a fascinating image of two of our planet’s lesser-known regions. 

Rowan Hooper catches up with Stuart Fowkes, the founder of Cities and Memory, one of the world’s biggest sounds projects, which has joined forces with scientists and musicians to present these sounds, and to interpret them.

To read about subjects like this and much more, you can subscribe to New Scientist magazine at newscientist.com.

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