UNDER THE SEA This Oct. 18, 2016 file photo from the Great Barrier Reef Marine Park Authority (GBRMPA) shows a diver swimming near corals on the Great Barrier Reef in Australia. GBRMPA PHOTO VIA AP
SYDNEY: A prolonged summer heat wave in Australia left 91 percent of the Great Barrier Reef's corals damaged by bleaching, according to a new government monitoring report.