Project Azorian (sometimes referred to by the mis-nomer Project Jennifer) was a covert United States Central Intelligence Agency (CIA) operation to raise the wreck of the Soviet Golf-class ballistic-missile submarine K-129 from the floor of the Pacific Ocean. Conducted between 1968 and 1974, the effort aimed to recover cryptographic materials, nuclear missiles, and other intelligence from the submarine, which had sunk in March 1968 approximately 1,560 nautical miles (2,890 km) northwest of Hawaii.

Hughes Glomar Explorer (CIA.gov)

Background

• Loss of K-129 – On 8 March 1968 the Soviet Navy’s K-129 suffered a catastrophic explosion and sank to a depth of roughly 16,500 ft (5,030 m). U.S. acoustic‐surveillance arrays recorded the event, allowing the U.S. Navy to locate the wreck months before the Soviets could mount a search.
• Intelligence opportunity – The CIA assessed that K-129 might still contain un-destroyed codebooks, encryption devices, and R-21 nuclear missiles—assets of immense intelligence value at the height of the Cold War.

Planning and Construction

• Cover story – To avoid provoking the Soviet Union, the CIA created a mining-exploration front company, Global Marine Development, and enlisted billionaire Howard Hughes to lend credibility. Officially, Hughes’s new vessel would harvest manganese nodules from the ocean floor.
• Hughes Glomar Explorer – Built by Sun Shipbuilding in Chester, Pennsylvania, the 50,000-ton drill-ship housed a massive moon pool and a claw-like “capture vehicle” nicknamed Clementine. The ship’s internal dry dock would conceal any recovered wreckage from outside view.
• Cost – Estimates put total expenditures between US $350 million and US $500 million (roughly US $2–3 billion in 2025 dollars).

Recovery Operation (1974)

1. Deployment – In June 1974 Hughes Glomar Explorer sailed to the recovery site, operating under the guise of deep-sea mining.
2. Claw descent – Over several weeks, Clementine was lowered 3 mi (4.8 km) to the seabed, maneuvered to encircle a 132-ft (40-m) section of the submarine’s forward hull, and sealed in place.
3. Lift – As the broken hull was winched upward, part of the capture cradle reportedly failed, causing roughly two-thirds of the load to break off and fall back to the seafloor.
4. Recovered material – The portion successfully raised contained at least two nuclear-torpedo warheads, sonar equipment, and the remains of six Soviet sailors. The CIA held a military funeral at sea and later provided the video to the Russian government (1992).
5. Soviet awareness – A Soviet trawler trailed the operation but failed to interfere directly, apparently uncertain of the vessel’s true mission.

Aftermath and Secrecy

• Cancelled follow-on – A planned second lift in 1975 was shelved amid budget concerns and growing press scrutiny.
• Glomar response – When journalists sought confirmation under the Freedom of Information Act, the CIA pioneered the phrase “neither confirm nor deny”—now known as the Glomar response.
• Declassification – Key details were declassified in 2010, though many technical specifics remain classified.

Legacy

Project Azorian remains one of the most ambitious and expensive intelligence operations ever attempted. It advanced deep-ocean engineering, coined a landmark legal doctrine on government secrecy, and became emblematic of Cold War espionage ingenuity.