Submarine.

Location of events unknown.

M/S naval rating Stanley Spence walking along quay with kit bag, he enters the submarine "Trespasser". He walks along with an officer. M/S man sitting down with earphones on. M/S officer and Stanley walking up to chart, they read it and then walk out of picture. L/S two submarines lying in harbour. M/S camera pans along submarines showing ratings and officers standing to attention on deck. Various shots of them on deck, they are dismissed and one sailor goes to unscrew the submarine's bell. M/S sailor closing hatch of submarine. M/S man sitting down with headphones on. M/S bow of submarine going through sea.

M/S of sailors sitting at table drinking tea. Various shots of submarine sailing along. M/S Stanley drinking tea. M/S of the others. C/U loudspeaker, the men hurriedly get up from the table. M/S man taking over at wheel of submarine. M/S sailor pulling switches. Various shots as the submarine starts to submerge. C/U meter showing depth, M/S as it continues to submerge. C/U of Stanley's face. C/U meter. M/S submarine going under. M/S sailors at switches. M/S periscope. Various shots as the Captain walks up to periscope and looks through it, M/S of officer in background looking at chart, then speaking to Captain. M/S submarine resurfacing.