A rather useless one-man mini submarine is demonstrated in a swimming pool.
Several shots show Explorer One, the world's first one-man mini submarine being prepared for a demonstration; equipment is checked and a man gets into a wet suit. Some men help him to lift the submarine into an open air swimming pool - probably Aldershot Lido.
The sub with the man sitting inside wearing breathing apparatus slowly submerges as it travels across the pool; onlookers point and take photographs. Underwater M/Ss of the sub drifting to the bottom of the pool; it doesn't appear to be very functional, just an open box for a diver to sit in.
Cuts exist - see separate record.