I crawled for 10 hours through the most claustrophobic cave in the world, Ogof Y Daren Cilau, which is home to one of the tightest squeezes known, 'The Vice'. The deeper you go into the cave, the tighter it becomes.
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Move with care
Do not run or jump in a cave. Plan each move carefully.
Do not enter a cave when there is rain predicted in the area. Cave often flood suddenly.
Never touch or damage stalactites or other cave formations. These take thousands of years to grow.