In 1968, the Soviet submarine K-129 sank in the Pacific, carrying nuclear weapons and Cold War secrets. After its location was pinpointed three miles beneath the ocean surface, the CIA tasked a trailblazing engineer named Curtis Crooke with designing the technology to bring it back up. Backed by billionaire Howard Hughes, they launched a covert $800 million operation that pushed the limits of engineering and espionage—but the final outcome remained shrouded in secrecy.

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