ALTHOUGH he is in full possession of his faculties and all of his limbs, Mark Erdmann is about to flush a shark from its hidey hole.
"Watch this," he says, and his rubber fins arc into the sky as he duck-dives and swims to a ledge about 4m down while I hover on the surface. Erdmann's hand disappears into darkness and a mottled, moth-coloured 2m shark darts out and stops on the bottom, about 10m away. It's a wobbegong, a carpet shark: not especially fearsome, certainly not aggressive, but a shark all the same.
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