Floating nudibranch
Sometimes nudibranchs are dislodged from their tight hold on the reef. This presents a rare opportunity to see their underside.
 Tank Cave, Australia Australia's Tank Cave was first dived in the early 1960s. Access was difficult and very little exploration was done. In the 1980s more passage was found and kilometres of permanent line have been laid in the years since.
 Tank Cave, AustraliaCave divers in Australia flock to one very special spot in the lower South East of South Australia. A small hole in a paddock leads to the water's edge at Tank Cave.
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