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Episode · the Gulf, more than 1,200 metres down · 31 October 2026

There's a Lake at the Bottom of the Ocean, and It Has a Beach

There's a lake on the floor of the Gulf, more than twelve hundred metres under the sea, with a surface, a shoreline and a beach made of mussels. This calm documentary goes down to its shore, over its edge and into the ground beneath it to find out where its salt comes from: a sea that dried out 165 million years ago.

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