Tributes to Brit father & son, 17, who drowned off Great Barrier Reef after getting swept out to sea on holiday / Tributes to two Brits who drowned while swimming near Great Barrier Reef / Dad and son who drowned at Great Barrier Reef named / Australia's next government may be Great Barrier Reef's last chance after sixth mass bleaching, conservationist says / Two British tourists drown near Great Barrier Reef / Ningaloo and Great Barrier Reef hit by 'profoundly distressing' simultaneous coral bleaching events / Can artificial intelligence save the Great Barrier Reef? / Big moms make big impact--half of the coral trout caught on Great Barrier Reef found to be from marine reserves / 'Catastrophic': Great Barrier Reef hit by its most widespread coral bleaching, study finds / Coral bleaching on Great Barrier Reef reaches 'catastrophic' levels