coral bleaching events are becoming more freqequent, leavg bebehind devastation. in many places, the colorful underwater world has turned into a graveyard. rereporter: thisis has got to be of t wororld'sest lolocaons fofor a unersisity lture.. and d ese researchers, students anand assistantsts, clad in bk wetsuits, arare about to g g o work. here, on l lizard islandnd, the ininvestigating the underwatar world of the great barrier r re. dr. anne hogoggett has liviven lizard islsland for 27 y years. no one knows the reef w well as shshe do. and shs s deep conceceed. dr. hoggt: t thelimate scientists who a fororasting wh is s gointo hapappein the coming dececades as the e world wawarms up predidicted that wewd geget back to baback coral blelg by about t the middle ofof this cecentury. but here we are in01016/17, 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