Soviet Submarine USO Encounter 1973

In June 1973, a Soviet Navy submarine conducting a Pacific patrol encountered an unidentified submerged object that appeared to shadow the submarine for 12 minutes, matching every course and speed change with precision. The Soviet commander logged the encounter as an encounter with an 'unidentified underwater object' — the Soviet naval equivalent of a USO report. The object eventually surfaced and was observed as it transitioned from the water to aerial flight, departing as a disc-shaped craft at extreme speed. US Naval Intelligence obtained information about this encounter through signals intelligence and human sources, incorporating it into the ONI's classified database of Unidentified Submerged Objects that had been maintained since the 1950s. Soviet naval records declassified after 1991 included hundreds of similar encounters logged by Soviet Navy vessels, revealing that both superpowers had been experiencing and documenting transmedium UAP since the Cold War began. The 1973 Pacific encounter was one of the most operationally detailed in the Soviet files.