The 5,000-metre-deep Australian canyon
Off the Bonney Coast of Australia lies an underwater canyon system so deep and so vast it is only now being mapped. The maze, which reaches depths of 5,000 metres, has turned out to be a biological hotspot, with the specially equipped Southern Surveyor research vessel pulling up undiscovered species of fish and plankton almost every time it voyages out.
Getting close: Kangaroo Island, near Adelaide, Australia, sits right in the middle of the unexplored canyons, and provides a taste of what the deep has to offer; hire dive packages from Kangaroo Island Dive Safaris begin at £67
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