ML FOLLOW SHOTs of a motorboat moving on a big lake with TILTs DOWN on sun reflection in water as the boat with camera on, moving fast. Various shots from different angles of a Caterpillar grader moving on a road under construction. MS of a river with PAN on biologists of the Freshwater Institute walking in river to garbage cans placed there for an experimentation on water pollution, men pouring silty liquid in cans. Several underwater shots of the product getting out of holes of garbage cans and spreading in river. Water surface shots of men pouring product in cans. Underwater shots of product and water current passing through tubular filters. Water surface shot of men taking off filters from posts. MS of cameraman wearing smoked equipment laying down on river bottom, filming. Various ESTABLISHING SHOTs of a river, underwater shots of the river bottom. Water surface shots of water current.