HMS Largs was a former Compagnie Generale Transatlantique (French Line)[1] fruit (banana) ship captured by the Royal Navy ship HMS Faulknor[2] five months after the Battle of France while docked at Gibraltar in November 1940 and commissioned as an "ocean boarding vessel".

[5] HMS Largs was used in 1942 for secret trials of a Canadian invention, diffused lighting camouflage.

This used dimmable lamps for counter-illumination, camouflage by bringing the brightness of the ship's superstructure to the same as the night sky.

The system of 60 lamps reduced the distance at which a ship could be seen from a surfaced submarine by 25% using binoculars, or by 33% using the naked eye.

She was sold off to a private company from Greece in 1964 as a cruise ship, and given the name MV Pleias.