The Röhrenquelle (Tubed Spring) is no longer recognisable as such because it is hidden by the Ibach embankment. Of special interest is the fact that at high tide this cave acts as a relief channel for the tubed spring. The water level in the cave rises by about 20m before the whole passage is flooded. It then surfaces via the Boulder-choked Spring entrance and flows into the Ibach.

The cave is only accessible when the first two siphons have been pumped out, but some depressions remain full of water and require freediving or diving with adequate equipment.


hydroplan   VersturzqSi






Versturzquelle during floods