Seascape: the state of our oceans is supported by

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A mysterious millionaire and the quest to live under the sea – podcast
Deep is a project backed by an anonymous millionaire to the tune of more than £100m that aims to establish a ‘permanent human presence’ under the sea from 2027. Guardian Seascape editor Lisa Bachelor visited the project on the Welsh border, and tells Madeleine Finlay what scientists hope to learn by spending extended periods living underwater