coral bleaching events are becoming more frequeuent, leavg behihind devastation. in many places, the colorful underwater world has turned into a graveyard. repoporter: this h has got to be of theorldld's bt locacatis for a univertyty lectu. and ththesresearchchs, students and d assistants, , clad in bk wewetsuits, are e about to geo wowork. here, on lizizard island, , the invevestigating the underwater world of the great barrier reee. drdr. anne hoggegett has liven lizard islanand for 27 yeaears. no one knows the reef aselell as she e does and e's dedeep concerned. . . hoggt: thehelimate scientis w who a forecasting wh is gogointo happepein the coming decadades as the woworld warmrms up predictcted that we d get t back to backck coral bleag by about thehe middle of t this centntury. but heree e are in016/6/17, d we are alrlready having g coral bleaching g one year aftfter e next. so we are decadeahahead ofherere the rsrst ca scenanario suggested wewe would be. reporter: nene leadshat t ses to be the rfrfecaussie lifestyl-- a alo with her huhusban lyle.e. their son