See http://colonialfilm.org.uk/node/4009 for source and the film. European team tackle eradication of the fly which causes Onchoceriasis (‘River Blindness’). Habitat of the fly and larvae. Exploration of the Victoria Nile for infestation sites. Construction of cross-river pipeline to carry insecticidal solution. Worker’s camp and arrival of supplies. Solution (DDT and fuel oil) added to river. Checking efficiency of treatment. Aircraft dropping beer cans and milk cartons containing DDT solution into inaccessible streams.