After permitting the company to dump 80,000 tonnes of waste a day into the Fly and Ok Tedi river system since 1984 BHP has now been given a final gift from the PNG National Government - an unrestricted legal indemnity for all the pollution and destruction it has already caused and will occur in the future as result of the continuing operation of its Ok Tedi mine. It has precipitated an unprecedented constitutional challenge by former PNG Prime Minister Sir Michael Somare.