Description: I. An HSL enters Shoreham harbour; the crew stand on deck, and the launch is securely moored; other, smaller, launches are moored nearby. Launch No 73 leaves the harbour (an American vessel); HSL No 183 moves from the camera, away from the harbour and out to sea; shots of Nos 183 and 73 arriving in harbour again, and of the former crew being helped ashore, after the HSL has been tied up; a Walrus flies overhead; film of Walrus taking off and landing (various takes); a man signals from the HSL with an Aldis lamp; close-up of hands on the wheel of the HSL and on the engine-room telegraph (signalling 'full-fore together'); film of a man fishing, from the deck - he hastily pulls in his line and runs down to the hold; others jump up, after relaxing, smoking etc. The HSL is cast off from a buoy (Shoreham in the background) - men stand on the jetty - one hauls on a rope.
II. Film of a HSL in rough sea - five men are standing on board, with their backs to camera; various on board, with their backs to camera; various shots of stern wave (with rear AA gun in foreground); on the bridge, a Signals Officer waits; on shore, we see a coastguard's signalling turret - two men (with a dog) prepare to signal. One flashes an Aldis, another watches through a telescope; general shot of harbour, with lamp fishing from coastguard turret in distance; two members of HSL crew (one in a white sweater); tattered RAF flag on the mast, film of HSL 183 travelling at speed through the water (and overtaking vessel from which footage shot).