CUs of group of workers in winter garb, of gloved hands thightening cable clamp with wrench. MLSs of seaway construction in winter. Front shot of bulldozer moving along narrow earth dam, PAN to three men working on side of causeway. Shots of causeway, floating piers in river, small "alligator" boat heading for camera. Shot of worker signalling as claw grab rises into frame. FOLLOW SHOT of grab as it wings over earth pile. Imaginative shot of reflection of boom and grab from windshield of operator's cab. General shots of activity, cofferdams, boats, barges, snow and water in foreground. LAS of derrick on barge. Sequence on cranes lowering cofferdam rails into place. Shots of barge full of rails being moored. CUs of oxy-acetylene torch at work. Longer shots of welders at work on cofferdam, of man blowing snow off beams with air hose. Shots of contractor's sign, of engineer and transit, of men being transfered from dam to barge via crane. HAS of cofferdam. AERIAL SHOTs of seaway construction area in Saint Lawrence River. Shot of highway, truck and horse-drawn sled.