The Tantalhöhle is the longest and most famous cave in the Hagengebirge mountains of Salzburg - a vast underground labyrinth stretching roughly 34 kilometers, hidden high above the Blühnbachtal valley. This is not a place for casual visitors but a serious destination for cave explorers, with an entrance perched on the steep southern cliffs of the Tantalköpfe.

Inside, the cave reveals enormous chambers, deep shafts and narrow passages that shift between breathtaking beauty and genuine danger. Passage names like 'Everything back, I only see abysses' or 'Gustl's Sarcophagus' hint at the drama of past expeditions, while others such as the Gothic Passage, the Stone Lake and the Hall of Stone Flowers reveal the cave's quieter, sculptural beauty. During snowmelt or heavy rain, the lowest sections can flood entirely, meaning access is seasonal and strictly for experienced cavers.

How to get there

• Blühnbachtal valley - approach involves difficult and dangerous scrambling over loose rock (Schrofenkletterei), suitable only for experienced, well-equipped cavers

Practical information

• Access to the cave is essentially only possible with experienced cavers or as part of expeditions organized by local caving associations
• The lowest section of the main passage (the so-called Sunk) can flood during snowmelt or heavy rainfall
• A bivouac shelter (Villa Atlantis) near the entrance has been renovated by the Salzburg Regional Caving Association

The cave was discovered in 1947 by Salzburg jeweler and caver Alfred Koppenwallner, and despite its name, it has nothing to do with the chemical element tantalum - it comes from 'Tanntal', meaning fir valley. Since 2020, exploration has resumed, with researchers hoping to connect it to neighboring cave systems, potentially forming one of the largest cave networks in the region.