Several shots from various angles of canal construction operations on south shore in winter, snow in evidence, Montreal skyline visible in background. Several shots from various angles of canal digging at Mercier Bridge in winter, snow in evidence (00/12/1956). MLS of lock at Mercier Bridge, no ships. Several shots of canal digging operations in summer. Several shots from various angles of lake freighters sailing on open water. Several LSs of lake freighters and other craft at locks. Shots of freighter Collingwood of Canada Steamship Lines. AERIAL SHOTs of locks and canals, of several lake freighters on open water. LSs of the Welland Canal, freighters in canal.