Eyre Highway, Nullabor

Our first stop on the Eyre highway was at Caiguna Blowhole - only 15m from the road. This opening and the underground cavity have clearance heights between 0.5 - 1.5m. The cave 'breathes out' when the air pressure falls and 'breathes in' when the air pressure rises again. The smaller the cave entrance the faster the air movement.

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