The Glomar Explorer: How the CIA Stole a Soviet Nuclear Submarine

The Signal That Never Came

On March 8, 1968, a Soviet Golf II-class submarine carrying three nuclear ballistic missiles left the port of Vladivostok on a routine patrol. Designation: K-129. It never transmitted its scheduled check-in signal.

The Soviets launched the largest naval search in their history. They found nothing. No wreckage. No bodies. No explanation. K-129 had simply ceased to exist somewhere in the North Pacific, northwest of Hawaii, at a depth of roughly 16,500 feet.

The U.S. Navy, listening through its classified SOSUS hydrophone network, a vast underwater acoustic surveillance system that ringed the Pacific, had heard something. A series of anomalous implosive sounds, picked up by sensors hundreds of miles apart. The Navy ran the intercepts backward through acoustic analysis and triangulated a position. Within weeks, American intelligence had a working theory about where K-129 went down.

The Soviets had no idea the Americans knew.

What Was Down There

K-129 carried three SS-N-5 Serb nuclear missiles. It also carried Soviet naval encryption codebooks, cipher equipment, and a nuclear torpedo. To the National Security Agency and the CIA, this was not a sunken ship. It was a prize.

The intelligence value of what lay on the ocean floor was staggering. Recovered codebooks could potentially unlock years of encrypted Soviet naval communications already on tape. The missile hardware would give American weapons engineers a direct look at Soviet nuclear warhead design. The torpedo, if intact, would reveal propulsion technology the West had been trying to reverse-engineer for years.

The only problem: the ship was three miles down. No salvage operation in history had ever attempted anything close to that depth. The ocean at 16,500 feet exerts a pressure of roughly 7,300 pounds per square inch. Human divers cannot survive below 2,000 feet. The engineering required to reach K-129 would have to be invented from scratch.

The CIA decided to try anyway.

Howard Hughes and the Cover Story

Every covert operation needs a legend, the fabricated story that explains activity that would otherwise raise questions. Project AZORIAN's legend was, by any measure, one of the most ambitious ever constructed.

The CIA needed to build a ship large enough to lower a specialized capture vehicle three miles to the seafloor, hold it steady against open-ocean currents, haul the submarine to the surface inside a massive internal moon pool, and do all of this without anyone, including the ship's own civilian crew, understanding what they were actually doing.

The cover story: deep-sea manganese nodule mining. And the perfect front man for a secretive, eccentric, vaguely plausible industrial venture was Howard Hughes.

Hughes had spent years building a reputation as a reclusive billionaire willing to fund strange and expensive projects. In 1970, the CIA approached him through intermediaries. A front company, Global Marine Development, was established. The ship was contracted under the name Hughes Glomar Explorer, officially described as a vessel for experimental seabed mineral extraction.

The ship was extraordinary. At 619 feet long, it was built around a central moon pool, a massive internal cavity that opened to the sea through the keel, large enough to lower and retrieve an object the size of a submarine. A derrick system on deck could generate 7,000 tons of lift. The entire capture mechanism, a claw-like steel apparatus the engineers called the "Clementine," was designed to envelope the hull of K-129 from below and lock onto it.

Construction took four years. The bill came to roughly $350 million. Adjusted for inflation, that's well over two billion dollars today.

The Operation

In July 1974, the Hughes Glomar Explorer arrived at the recovery site. The crew, mostly civilian contractors, had been told they were testing deep-sea mining equipment. Specially cleared CIA officers handled the classified systems. The rest of the crew performed legitimate shipboard work.

The Clementine descended over a period of days, guided by a network of underwater transponders. At 16,500 feet, the camera feeds showed what the acoustic data had predicted: K-129, broken in two, lying on its side in the silt.

The capture vehicle made contact with the forward section of the hull. The hydraulic claws engaged. The lift began.

At some point during the ascent, between one and two miles below the surface, something failed. Declassified CIA documents describe the event with clinical restraint: "a significant portion of the target object was lost due to structural failure of the capture vehicle." The exact mechanism of failure has never been fully disclosed in public documents.

What the CIA recovered was approximately one-third of K-129's forward hull. Inside: two nuclear torpedoes, cryptographic materials, the remains of six Soviet sailors, and documents that are still classified.

What they did not recover: the missiles, the warhead section, and the bulk of the intelligence they came for.

The Burial at Sea

The six recovered Soviet sailors were given a formal burial at sea aboard the Glomar Explorer. The CIA filmed the ceremony.

The footage was declassified decades later. In it, American officers in civilian clothes stand at the ship's rail in the open Pacific. A folded Soviet naval flag is present. The ceremony is conducted with full military honors, translated into Russian.

Whatever one believes about the agency that planned this operation, that film is difficult to watch without a particular kind of feeling. Six men who died in the service of an adversarial state, recovered by the country they had been trained to fear, given dignity at the bottom of a mission that was never supposed to exist.

The CIA eventually sent a copy of the film to the Russian government after the Cold War ended. The families of the K-129 crew have fought for years to get the full record declassified. As of this writing, most of it is not.

The Leak That Changed Everything

In June 1974, while the Glomar Explorer was still on station, a burglary occurred at a Hughes Corporation office in Los Angeles. Among the files taken were documents referencing the project. The thieves, apparently believing they had found evidence of a Hughes money-laundering operation, eventually contacted several news organizations.

The Los Angeles Times reporter Seymour Hersh confirmed enough of the story to publish. CIA Director William Colby made a personal appeal to suppress it. The Times held. Other outlets didn't. By February 1975, the story was out.

The Soviets sent naval vessels to shadow the Glomar Explorer on its next planned voyage. The second recovery mission, which would have targeted the aft section of K-129, the section containing the nuclear missiles, was cancelled.

The CIA never returned.

What sits on the floor of the North Pacific, three miles down and twelve hundred miles northwest of Hawaii, is still there. The aft section of K-129, with its three nuclear warheads, has been sitting in the dark since 1968. No government has publicly announced any plan to retrieve it.

What the Declassified Record Actually Shows

The CIA has released a substantial body of AZORIAN documents through the FOIA process, though key sections remain redacted. What the available record shows is a program that operated with extraordinary compartmentalization, meaning the number of people who understood what the project actually was could be counted in the dozens, within an operation that employed thousands.

The documents reveal that AZORIAN was approved at the highest levels of the Nixon administration. Henry Kissinger is referenced in internal communications. The project ran parallel to the era of the Church Committee, the congressional investigation into CIA abuses that also exposed MKULTRA, Operation CHAOS, and the agency's assassination programs.

The CIA was building a ship to steal a nuclear submarine at the same moment it was facing the most intense congressional scrutiny in its history. That simultaneity is not coincidence. It reflects a particular institutional logic: keep moving, keep building, keep classifying, and trust that the weight of complexity will protect the operation longer than any individual secret could.

The Glomar Explorer itself was eventually sold to the U.S. Navy, then leased for actual commercial deep-sea drilling. It was scrapped in 2015.

The "Glomar response," the phrase "we can neither confirm nor deny," entered the legal lexicon as a direct result of FOIA requests related to this operation. When journalists and researchers submitted FOIA requests asking about the CIA's connection to Hughes and the Glomar Explorer, the agency coined a new category of non-answer. Courts eventually upheld it. The phrase is now standard practice across the entire federal government when agencies want to acknowledge that a question exists without answering it.

Every time a government agency tells you it can neither confirm nor deny something, you are living in the legal aftermath of Project AZORIAN.