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If there’s any doubt that the deep sea is as exciting to explore as the moon or Mars, this episode puts the question to rest, as Robin and Brian wade through the back catalogue to learn all about the ocean. Professor Lloyd Peck from the British Antarctic Survey tells them about the weird and wonderful creatures he’s encountered at sea, from rat-tailed fish to bacteria that feed off sulphides that could kill them, but Dave Gorman is still sceptical that it’s an environment worth investigating. And he's not the only one – fellow comedian Tim Minchin might live near Australia’s best beaches but says he’s terrified by the idea of getting in a submarine, let alone sharing such a small space with Brian Cox!

Episodes featured:
Series 6: Oceans: The Last Great Unexplored Frontier?
Series 21: Coral Reefs
Series 24: Exploring the Deep

New episodes will be released on Wednesdays, but if you’re in the UK, listen to new episodes, a week early, first on ³ÉÈË¿ìÊÖ Sounds: bbc.in/3K3Jzy

Producer: Marijke Peters
Executive Producer: Alexandra Feachem