Submarine X-3 sank in a training accident in Loch Striven on 4th November 1942.

The Submarine was raised later the same day by the Salvage Vessel HMS TEDWORTH. After refitting at Vickers at Barrow in Furness the Submarine was returned to service.

There were no casualties. All three onboard (all Sub Lieutenants) were trainees and managed to escape safely using DSEA sets after about 40 minutes on the bottom in approximately 110 feet of water.

One Sub Lieutenant John Thornton Lorimer RNVR continued to serve in X-Craft however the other two, Sub Lieutenants Gay and Laites transferred to another Branch of the royal Navy.