When the HMS Poseidon struck a Chinese freighter in the Gulf of Bohai in 1931, the collision sparked a devastating accident that would see the British submarine plunge to the ocean floor in mere minutes, claiming the lives of nearly half the crew, but then making history through the daring escape of six submariners who found themselves trapped in the torpedo room of the doomed vessel and made their way to the surface nearly an hour after its sinking.

This week on Sinica, Kaiser and Jeremy help peel back the mystery of this Poseidon, as well as the secret Chinese salvage operation that took place decades later unbeknowst to the British Navy, in a discussion with Steven Schwankert, managing editor of The Beijinger, owner of the SinoScuba training school, and now author of the just-released book Poseidon: China's Secret Salvage of Britain's Lost Submarine.

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