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I went to this Fall with a guide but did not clime up more that 3 - there is no other way out if you can't breath any more - tunnels are so narrow & climbing up is with a rope through the strong flow of water - you need to be lucky coming down too - hit once with rocks , you will not need any more.

Good thing about it is - it is a very natural & primitive. Try it before it gets modernize if you like taking risk & dangerous.