Underwater shots of frogmen swimming, descending in cage, working on bottom of Georgian Bay, taking core samples, photographs. Several shots of frogmen swimming past camera, past underwater habitat, of men emerging from underside of habitat. Shot of men swimming past camera, working around habitat. LS of habitat, bubbles streaming upward, objects being lowered from surface. TILT UP cage to frogman perched on top of it. LAS of man in cage. Shot of scuba diver moving about underwater habitat. ZOOM IN on habitat from above, two divers at hatch. Shot of diver under habitat.