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Operation Ivy Bells....in October 1971, the United States sent the purpose-modified submarine USS Halibut deep into the Sea of Okhotsk. Funds for the project were diverted secretly from the deep-submergence rescue vehicle (DSRV) program, and the modified submarines were shown with fake DSRV simulators attached to them. These were early diver lockouts. US Navy Divers working from Halibut found the cable in 400 feet (120 m) of water and installed a 20-foot (6.1 m) long device, which wrapped around the cable without piercing its casing and recorded all communications made over it. The large recording device was designed to detach if the cable was raised for repair.

The tapping of the Soviet naval cable was so secret that most sailors involved did not have the security clearance needed to know about it. A cover story was thus created to disguise the actual mission: it was claimed that the spy submarines were sent to the Soviet naval range in the Sea of Okhotsk to recover the Soviet SS-N-12 Sandbox supersonic anti-ship missile (AShM) debris so that countermeasures could be developed. https://en.wikipedia.org/wiki/Operation_Ivy_Bells