PAN along building under construction and along construction site. MS of workers standing around hole in ground, worker lowering dynamite charge into hole. CS of dynamite charge being lowered into ground. HALS PANs over Beauharnois hydro-electric power dam under construction, including views of large excavation machinery. MLSs of rock wall of cleared space in river bed, of rock wall exploding. CS and CU of worker pushing control handle for blast. Sequence in excavated area showing dump trucks driving by, steam shovels digging into ground, dumping heavy rock load into dump truck. Shots of drilling equipment in action. HACS of wooden boxes marked "Forcite" scattered around.