pieces, at least one sample was reverse engineered. It was discovered that the SS-N-12 AShM was guided by radar only, and the infrared guidance previously suspected did not exist. Use Each month, divers retrieved the recordings and installed a new set of tapes. The recordings were then delivered to the NSA for processing and dissemination to other U.S. intelligence agencies. The first tapes recorded revealed that the Soviets were so sure of the cable's security that the majority of the conversations made over it were unencrypted. The eavesdropping on the traffic between senior Soviet officers provided invaluable information on naval operations at Petropavlovsk, the Pacific Fleet's primary nuclear submarine base, home to Yankee and Delta class nuclear-powered ballistic missile submarines. Eventually, more taps were installed on Soviet lines in other parts of the world, with more advanced instruments built by AT&T's Bell Laboratories that were radioisotope thermoelectric generator-powered and could store a year's worth of data. Other submarines were used for this role, including , , and . Seawolf was almost lost during one of these missions—she was stranded on the bottom after a storm and almost had to use her self-destruct charges to scuttle the ship with her crew. Compromise This operation was compromised by Ronald Pelton, a 44-year-old veteran of the NSA, who was fluent in Russian. At the time, Pelton was $65,000 ($ today) in debt, and had filed for personal bankruptcy just three months before he resigned. With only a few hundred dollars in the bank, Pelton walked into the Soviet embassy in Washington, D.C. in January 1980, and offered to sell what he knew to the KGB for money. No documents were passed from Pelton to the Soviets, as he had an extremely good memory: he reportedly received $35,000 from the KGB for the intelligence he provided from 1980 to 1983, and for the intelligence on the Operation Ivy Bells, the KGB gave him $5,000. The Soviets did not immediately take any action on this information; however, in 1981, surveillance satellites showed Soviet warships, including a salvage vessel, anchored over the site of the tap in the Sea of Okhotsk. The USS Parche (SSN-683) was dispatched to recover the device, but the American divers were unable to find it and it was concluded that the Soviets had taken it. In July 1985, Vitaly Yurchenko, a KGB colonel who was Pelton's initial contact in Washington, D.C.,