Falkensteiner Höhle
An active water cave near Grabenstetten on the Swabian Jura, from which the Elsach stream flows, explored for about 5 km. The first sump lies about 400–480 m inside; beyond a boulder choke at about 2,750 m further sumps follow, and only experienced cave divers can go past them. Heavy rain or snowmelt can raise the water within a short time and flood the cave up to its entrance. Cave diver Jochen Hasenmayer pushed through the sumps in 1979–1980.
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