Deep below the Australian Outback are some of the largest and most mysterious cave systems on Earth - where a team of explorers once miraculously survived after being trapped for 27 hours by an avalanche.Expert cave diver Andrew Wight led a 15-person expedition to the Pannikin Plains system, one of the many which honeycomb the world's largest continuous piece of limestone bedrock on top of which lies the Nullarbor Plain.Above the surface is a vast treeless desert on the Western Australian and South Australian border but below are subterranean caverns and passages partially filled with water that flows into the Great Australian Bight.
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