A sailor gets into frogman gear then gets into a tank and swims about underwater.
Titles read: "FROGMAN".
Location of events unknown.
Various shots show a sailor putting on a woollen undersuit as the first part of his frogman outfit. He puts on rubber trouser with braces, puts on flippers, then a rubber top with hood attached. The breathing equipment is put onto his shoulders. He puts on his helmet and jumps into a tank.
Underwater shots of him swimming about. View from above the tank. Underwater shot as he does forward rolls. He then comes up to the surface.