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In the shadow of the Cold War, the Vietnam conflict, and the Apollo moon walk, a revolutionary Swiss-built submarine changed history. In 1969, the PX-15 Ben Franklin, the world's first manned deep-sea research sub, drifted up the Gulf Stream from Florida to Halifax, gathering crucial data for NASA. The Disappearance of the PX-15 follows maritime archeologist James Delgado 35 years later as he restores the sub and unites the surviving aquanauts in an emotional story of courage and vision.
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