Various shots on a lake of the Mackenzie District of a team of the Freshwater Institute at work, one man entering lake all dressed up to install equipment in middle of the lake, of him diving under water and coming back at surface to breathe several times including shots of two men on the bank, of the man walking out of water. Several shots from different angles of men of the team in rubber boat pouring oil over a plastic fence dividing the lake in two parts for the experience. Shots of an helicopter flying around, of oil spilling on water surface. MS of an helicopter taking off with another one flying behind it. Several shots from different angles of another lake, of a team of the Institute doing the same experience, one man taking pictures, of the helicopters flying around, of the oil spilling at surface of the lake, of one helicopter landing, of a wind indicator and PAN on a communication shed with an antenna on the roof, of two men using it, one talking on a phone and the other one writing down reading. Shots of the oily surface of the lake, of men at work at communication shed, one man on the roof placing instrument on a tripod, of a man on lake bank taking samples of oily vegetation on lake. More shots of the men pouring oil into lake, of men on bank looking at samples, of an helicopter taking off and flying around, of the second helicopter transporting a hanged canoe.