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If the rhetoric from marine biologists is to be believed, then the Great Barrier Reef is now in the grip of a “bommie apocalypse”.

As I continued to dive the Nursery Bommie, the fluorescent pinks, blues, purples and greens became more abundant.

Graphic: coral bleaching Put simply, the majority of the corals on this bommie – bleached or fluorescent – were clearly dead or dying.

I pulled on my mask and dropped off the back of the boat into the warm water above Nursery Bommie, a dive site at Agincourt Reef more than 70km offshore from Port Douglas, in far-north Queensland, Australia.