The British submarine HMS Poseidon sank off the Chinese coast during normal exercises in 1931 having struck a freighter. Just over half of her crew made it out of the hatches as she sank. Twenty-six remained trapped. Eight of those attempted to surface using an early form of diving equipment specifically designed for submarine escapes. Five of those survived and became national heroes. And then, at an unknown time in the subsequent years, the Chinese government secretly raised the wreck. To find out more about this remarkable story which takes us through themes of imperialism, international sea power, the development of submarine and diving technology and medical history, Dr Sam Willis spoke with historian Steen Schwankert. Editor and award-winning reporter with seventeen years of experience in Greater China, Steven is the Asia chapter chair of The Explorers Club, a Fellow of the Royal Geographical Society, and founder of SinoScuba, Beijing's first professional scuba-diving operator. Steven uncovered this story and spent many years researching it. He is the author of the book Poseidon: China's Secret Salvage of Britain's Lost Submarine.

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