Royal Navy submarine HMS Poseidon sank in collision with a Chinese freighter during routine exercises in 1931 off Weihaiwei. Thirty of its fifty-six-man crew scrambled out of the hatches as it went down. Of the twenty-six who remained inside, eight attempted to surface using "Davis gear," an early form of diving equipment: six of them made it safely to the surface in the first escape of this kind in submarine history and became heroes. The incident...
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