Project Azorian

"Azorian" (erroneously called "Jennifer" after its Top Secret Security Compartment by the press) was the code name for a U.S. Central Intelligence Agency (CIA) project to recover the sunken Soviet submarine K-129 from the Pacific Ocean floor in the summer of 1974, using the purpose-built ship Hughes Glomar Explorer.^[3] The 1968 sinking of the K-129 occurred approximately 1,560 nautical miles (2,890 km) northwest of Hawaii.^[4] Project Azorian was one of the most complex, expensive, and secretive intelligence operations of the Cold War at a cost of about $800 million ($3.7 billion in 2013 dollars).

• http://en.wikipedia.org/wiki/Project Azorian
• Azorian: The Raising of the K-129