A brown manganese nodule sits in Lucite in the CIA Museum. Glomar Explorer recovered it from the Pacific during a mission publicly described as deep-sea mining. The mining story was cover for Project AZORIAN, the CIA’s attempt to raise part of the Soviet submarine K-129 from about 16,500 feet of water. The rock matters because the cover was built to survive scrutiny: the ship, its machinery, its corporate identity, and even the material it claimed to be collecting had to look plausible together.
In the early 1970s, the public explanation for one of the strangest ships ever constructed was that Howard Hughes intended to mine mineral nodules from the deep Pacific. The ship was called the Hughes Glomar Explorer. It carried enormous lifting machinery, a central opening through its hull, equipment capable of working several miles beneath the sea and enough odd engineering to attract attention almost anywhere it went.
The explanation was plausible because deep-ocean mining was plausible.
The CIA was actually trying to recover a Soviet submarine.
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And somewhere along the way, Glomar Explorer really did bring up manganese nodules.
The submarine the Soviets could not find
K-129 left the Soviet naval base at Petropavlovsk on the Kamchatka Peninsula in 1968 carrying three nuclear-armed SS-N-4 ballistic missiles. It never completed its patrol.
The submarine and its crew disappeared in the North Pacific. Soviet forces searched extensively and eventually gave up. American intelligence kept looking. USS Halibut, a specially equipped U.S. submarine, ultimately located the wreck.
The cause of K-129’s loss remains unresolved. Naval History and Heritage Command rejects the claim that USS Swordfish collided with it, noting that no American submarine was within 300 miles when K-129 was lost. CIA summaries also differ slightly on the horizontal geography, placing the wreck roughly 1,500 or 1,800 miles northwest of Hawaiʻi. Those differences do not change the salvage problem: the wreck lay about 16,500 feet below the North Pacific.
At 16,500 feet, there was no existing salvage ship waiting for the assignment. They would have to build one.
For scale, compare that depth with the 240-foot submarine rescue behind Final Vestige’s The Rescue Machine Nobody Had Ever Needed. The missions were completely different, but the difference in depth makes the AZORIAN engineering problem easier to appreciate.
The thing everyone was allowed to see
Recovering the target section of K-129 meant lifting something the CIA describes as roughly 132 feet long and about 1,750 tons from an abyss deeper than many mountains are tall.
Doing it secretly created a second engineering problem almost as difficult as the first.
You cannot hide a roughly 600-foot industrial ship in a warehouse. You cannot build it, launch it, crew it and send it into the Pacific while pretending nobody has seen it.
So the ship itself was not hidden. Its reason for existing was.
Howard Hughes supplied the cover. The public project was deep-sea mineral exploration, specifically the recovery of manganese nodules from the ocean floor. Hughes was useful precisely because an eccentric billionaire spending an extraordinary amount of money on a futuristic industrial project did not require much additional explanation.
The cover had physical consequences. Glomar Explorer needed equipment that could plausibly belong to an ocean-mining ship while actually performing a submarine recovery. The vessel had a drilling-style derrick, a pipe-handling system, powerful station-keeping equipment and a huge central docking well—the “moon pool”—through which the real recovery could take place out of sight beneath the ship.
The capture vehicle was built under cover as well. CIA accounts say it was loaded aboard from beneath the ship using a specially designed submerged barge. Someone watching from another vessel or from the air would not see a giant mechanical claw being swung onto the deck.
The claw had a name. Clementine.
Build the machine that builds the machine
AZORIAN required supporting machinery on the same scale as the recovery system itself. The Sun 800 crane was built to handle loads involved in assembling Glomar Explorer, including the roughly 630-ton gimbal platform. The capture vehicle needed a submerged barge so it could be transferred beneath the ship without being exposed on deck. By the time the vessel sailed, the recovery system depended on a purpose-built ship, crane, barge, pipe-handling system, moon pool, and capture vehicle—all while remaining consistent with the deep-sea-mining cover.
Sixty feet at a time
Glomar Explorer arrived over the recovery site on July 4, 1974. Nearby Soviet vessels watched the strange mining ship. The CIA’s cover had to continue functioning while the actual recovery was happening beneath them.
Clementine descended through the moon pool. The ship lowered the capture vehicle by assembling a vertical string of steel pipe in roughly sixty-foot sections. One length went in. Then another. Then another.
That continued until the machinery was hanging more than three miles below the ship.
Clementine reached K-129. The jaws closed around the wreck. Then the process reversed. Pipe section after pipe section came back out as the submarine began rising toward the surface.
Clementine closed around the target and the ship began recovering the pipe string section by section. During the ascent, part of K-129 broke away and fell back to the seafloor. CIA public accounts differ on exactly how far the wreck had been raised when the failure occurred, describing it as roughly one-third or about halfway to the surface. A separate CIA review says the capture vehicle had already risen more than 6,700 feet when two grabber arms failed and nearly 100 feet of the submarine section broke away. The exact fraction varies by account; the result does not. Only part of the intended target reached the moon pool.
Sherman Wetmore, one of the project’s lead engineers, was still thinking about that failure nearly half a century later. During a 2022 visit to CIA Headquarters, he said the broken claw continued to haunt him.
The remaining section reached the moon pool. What exactly came up with it is a subject where popular accounts tend to become much more confident than the CIA.
The Agency publicly acknowledges one profoundly human discovery. There were six bodies inside.
Six sailors
The six Soviet submariners had been on the ocean floor since 1968. The Americans gave them a formal military burial at sea. For years, almost nobody outside the operation knew it had happened. In 1992, Director of Central Intelligence Robert Gates presented Russian President Boris Yeltsin with a film of the burial ceremony.
There are claims in books and popular retellings about exactly what intelligence material, weapons or equipment the recovered section contained. I am deliberately not building that inventory here.
The CIA itself says that much of what was retrieved remains classified. That is a useful limit. It tells us the recovery produced more than the Agency currently describes without giving us permission to fill the blank ourselves.
The second trip
The CIA wanted to go back. Planning began almost immediately for another attempt to recover what had fallen away. The machinery still existed. The ship still existed. The cover, however, had started coming apart for reasons that had almost nothing to do with Soviet counterintelligence.
Before Glomar Explorer sailed in 1974, thieves broke into an office belonging to Hughes’s organization in Los Angeles. Among the stolen material was a document connecting Hughes to the CIA and the ship.
Trying to recover the document pulled the FBI into the matter. The FBI involved the Los Angeles Police Department. The effort attracted attention. Reporters began hearing pieces of the story.
This is a pleasingly untidy way for one of the Cold War’s most elaborate engineering secrets to unravel. The CIA had managed to conceal a submarine-recovery system hanging three miles beneath a ship while Soviet vessels watched nearby. A burglary in Los Angeles helped expose it.
February 7
CIA Director William Colby personally asked journalists who had learned about AZORIAN not to publish. For a while, several held the story.
On February 7, 1975, the Los Angeles Times published an account connecting the burglary, Hughes and the CIA operation. Investigative reporter Jack Anderson later pushed the story onto national television on March 18.
The Ford administration faced an odd problem. A direct denial might later prove false. Confirmation would tell the Soviet Union what the United States had actually done and effectively finish any chance of returning.
So the government did something else. It would neither confirm nor deny the reports.
The second recovery never happened.
The ship became a legal term
Journalist Harriet Ann Phillippi filed a Freedom of Information Act request seeking CIA records about reported Agency contacts with journalists concerning Glomar Explorer. The CIA refused even to say whether responsive records existed.
That dispute became Phillippi v. CIA.
The response acquired a name from the ship. A Glomar response now means that an agency neither confirms nor denies the existence of requested records because acknowledging either answer could itself reveal protected information. The Justice Department still uses the term in its FOIA guidance.
The rock
The manganese nodule survives because the cover story went beyond a sentence about ocean mining. Glomar Explorer carried machinery that could plausibly belong to that work, the crew operated under the Hughes/Summa identity, and the ship actually recovered nodules from the Pacific. The CIA Museum now displays one of them in Lucite. It is a small object, but it shows how thoroughly AZORIAN’s public explanation was engineered into the operation itself.
Sources & Further Reading
- CIA Museum, “Project AZORIAN”. The core institutional history of K-129, the Hughes cover, Glomar Explorer, Clementine, the partial recovery and the six Soviet sailors.
- CIA, “The Exposing of Project AZORIAN”. The press chronology, disclosure and the origins of the Glomar response.
- CIA, “Honoring the Mission of Project AZORIAN”. Lead engineer Sherman Wetmore’s recollections and later CIA Museum material.
- Naval History and Heritage Command, “Lost With All Hands”. Navy treatment of K-129’s loss and competing collision claims.
- Phillippi v. CIA and Department of Justice FOIA guidance. The legal afterlife of the operation’s refusal to confirm or deny.