How the CIA recovered the sunken Soviet submarine K-124 from a depth of 4,800 m.

Project Azorian (also called "Jennifer" by the press after its Top Secret Security Compartment) was a U.S. Central Intelligence Agency (CIA) project to recover the sunken Soviet submarine K-129 from the Pacific Ocean floor in 1974 using the purpose-built ship Hughes Glomar Explorer.[2][3] The 1968 sinking of K-129 occurred about 1,600 miles (2,600 km) northwest of Hawaii.
Project Azorian was one of the most complex, expensive, and secretive intelligence operations of the Cold War at a cost of about $800 million, or $4.9 billion today.

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