Report on "Operation Noah" and on efforts to tackle another ecological problem created by the construction of the Kariba Dam, the spread of a floating water fern.

Wildlife is being stranded on small islands behind the Dam as the water level rises to its peak. Animals including antelopes, gazelles and a warthog rush past the camera as they are driven towards nets, tied up and then shipped to safe land. Elephants and a hippopotamus are also saved. Flooding of ca. 2000 square miles of land has been accompanied by the gigantic growth over ca. 200 square miles of water of "salvinia auriculata", a plant of South American origin which is choking the bays fished by African villagers. Research to discover a suitable chemical to destroy the plant is in progress, although the threat remains that other plants could create similar problems for fishing and navigation. Benefits of the Kariba Dam far outweigh these temporary evils. Dam provides Southern Rhodesia with practically all her power needs and has created an excellent fishing lake, at present being investigated by government scientists.