When the sea temperature in PNG's famous dive spot, Kimbe Bay, reached 32 degrees C in March, Max Benjamin knew the corals would bleach. The President of the PNG Divers Association was right. Before long, he observed at least 10 per cent of corals bleaching on many of the area's reefs. Mr Benjamin is concerned about the increasing incidence of coral bleaching in PNG. "In the last four years there has been a lot of stress on the reefs," he said. There was a bleaching event in 1996, then in 1997 a drought and high winds affected the reefs. In the summer of 1999 bleaching affected around 10 percent of corals. Now, it's happened again in 2000. "The reefs look OK, but it's nibbling away at them every year," he said. "It's beyond our control - we just sit and hope that the temperature will drop."