Tobermory underwater habitat: several shots of two divers under plastic dome with word "sublimnos" written on it, of other divers moving about. LS of two divers under dome. Shot of bubbles rising to surface from cameraman. Shots of diver at work around habitat. LS of crayfish moving on sand. TRAVELLING SHOT along underwater cable (?). Cut to bubbles rising from surfacing diver. MCS of diver in red suit picking up clam, measuring it. Interior view of underwater habitat through porthole, man in red suit inside.