Diving in Megalodonten canyon siphon, Hirlatzhöhle, Upper Austria.
Hirlatzhöhle is Austria’s 3rd longest cave with a total length of over 113 km. The current focus of exploration is at the far west, the far east and the highest parts of the cave. All those areas are only reachable by long camping trips lasting several days. Diving in Hirlatzhöhle has also been of interest for a long time – there are several sumps to be found in the cave, and diving through them lead to discovery of long passages.
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