HMS Cachalot (N83) was one of the six-ship class of Grampus-class mine-laying submarine of the Royal Navy.

She was rammed and sunk by the Italian torpedo boat Generale Achille Papa on 30 July 1941.

At 2 o’clock on the morning of 30 July the Italian torpedo boat Generale Achille Papa was spotted causing her to dive.

Cachalot attempted to dive again but the upper hatch jammed, and the Italian destroyer rammed her.

The crew scuttled the ship as they abandoned her and all personnel except for a Maltese steward were picked up by the Italians.