Beneath the plains of the Nullarbor lies an underground world formed over millions of years abc.net.au - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from abc.net.au Daily Mail and Mail on Sunday newspapers.
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As a subterranean ecologist, Stefan Eberhard has spent his working life transfixed by caves and the creatures that live inside them.
He began cave diving as as young man, and was part of a team which discovered a vast underwater cathedral inside Tasmanian s Junee cave system.
One of the greatest adventures of Stefan s working life has been inside the caves which lie under the Nullarbor Plains, called Dolines.
They are big enough to park three trains side by side, and the water is so clear it s invisible.
The race to explore the Nullarbor s dolines took off in earnest in the 1980s, when teams of Australian and French cave divers began using underwater scooters and hand-made rafts to plummet further and further into their depths.