MLS of lock control booth, short PAN to LAS of bow, of hull, of freighter "Virgilia" moving slowly across frame. Rear shot of freighter moving away. LS of lock gates opening. Cut to lake freighter "Prescott" half way out and moving closer to camera. LAS of funnel, TILT DOWN to stern of moving "Prescott". Front LS and MS of motor cargo ship slipping into lock. MS of stern moving away. HAS of freighter "Trans Ontario" moving into lock, of superstructure, of streamlined funnel moving across frame. LAS of lift bridge at Saint-Lambert Lock, TILT DOWN to "Trans Ontario" freighter moving through lock. LAS of bow, of hull, of superstructure of "Trans Ontario" freighter. Rear shot of canaller moving under lift bridge. MLS of lift bridge coming down. Rear shot of hull and stern of freighter "Dommtor" from Hamburg moving through lock. LAS of towering lock gates closing. Shots of ship's officers on bridge, ship in locks, of "Trans Ontario" freighter in Saint Catherine's Lock, of "Panagiotis" in lock, lift bridge lifting.