Soviet submarine K-129 (1960)

Sinking

K-129, having completed two 70-day ballistic-missile combat patrols in 1967, was tasked with her third patrol in February 1968, with an expected completion date of 5 May 1968. Upon departure on 24 February, K-129 reached deep water, conducted a test dive, returned to the surface and reported by radio that all was well, and proceeded on patrol.

Sinking

Soviet search efforts, lacking the equivalent of the U.S. SOSUS system, failed to find K-129; and, eventually, Soviet naval activity in the North Pacific returned to normal. K-129 was subsequently declared lost with all hands.

Media and official reporting

According to a report released by the US Navy, the pressure-hull of the 40-foot bow-section was intact forward of the break-point, but had been subject to massive internal destruction.

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