In 1968 a Soviet submarine sunk in 16,500 of water 1500 miles NW of Hawaii with nuclear missiles and cryptographic material onboard. This is the amazing story of how the CIA recovered part of that sub and pulled off one of the most incredible engineering feats in history, without the Soviets or the American public knowing what was going on until journalist Seymour Hersch published the story a year later, in 1975.