On the morning of May 23, 1939, a state-of-the-art U.S. Navy’s submarine, the USS Squalus, was doing a routine test dive when something went terribly wrong. The sub began flooding, and plunged 240 feet down to the bottom of the ocean, trapping the dozens of sailors aboard. The ship’s captain knew he had to act fast if he had any hope of saving his crew from a horrible death.

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