Submarine incident off Kola Peninsula (1993)

The 1993 submarine Incident off Kola Peninsula was a collision between the US Navy nuclear attack submarine USS Grayling and the Russian Navy nuclear ballistic missile submarine K-407 Novomoskovsk some 150 km (90 mi) north of the Russian naval base of Severomorsk, on 20 March 1993. The incident took place when the American submarine, who was trailing her Russian counterpart, lost track of Novomoskovsk.

Source: Wikipedia — Submarine incident off Kola Peninsula (1993) (CC BY-SA 4.0)