HMS Turpin (pennant number P354) was one a group three T-class submarines of the Royal Navy which entered service in the last few months of World War II.

[1] Turpin was laid down at Chatham Dockyard on 24 May 1943, was launched on 5 August 1944 and completed on 18 December 1944 (although she had already been commissioned on 1 October that year).

In 1955, Turpin was inside the arctic circle on an ELINT mission, listening for specific frequency bands of Soviet radars.

The operator registered that they were about to be rammed by a Soviet Navy surface vessel, and a crash dive was ordered.

[5] Turpin was sold to the Israeli Navy in 1965, and renamed Leviathan, after a biblical sea monster.