The Blauhöhle is the largest cave system in the Swabian Alps in southern Germany. The Blauhöhle presumably originated in a time when the Danube still flowed through the Blau valley. Since the shifting of the Danube, several small rivers, the Schmiech, the Ach, and the Blau, have flowed through this valley. The cave system begins about 21 meters under water at the base of the Blautopf. It continues west and northwest, rising and falling several times until after a horizontal distance of about 1,200 metres it comes above the level of ground water and opens into the second big air-filled chamber. The maximum depth of the cave under water is 42 metres .
This chamber was first discovered in 1985 by Jochen Hasenmayer, who named it Mörikedom . Hasenmayer's diving accident in the Wolfgangsee, resulted in a long break in its exploration. For several years the cave has been explored by the Arbeitsgemeinschaft Blautopf , a team of cave divers from several different regional groups. This group has made progress exploring the cave, including making exact measurements of the way to the Mörikedom. The improvement of underwater breathing technology, especially the rebreather, has allowed for longer dives carrying less weight. The discovery of the Wolkenschloss , another large, air-filled cavern, and the so-called Landweg , a long, open cave river behind the Mörikedom, were great successes for the Arbeitsgemeinschaft.
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