page_title: Grotto Calgeron
section_title: The Cavity
hierarchical_section_title: Grotto Calgeron / The Cavity
caption_attribution_description: il lago Roner nella grotta Calgeron
context_page_description: Grotto Calgeron, also known as the GB Trener cave, is a natural cavity that is located near the village of Grigno in Valsugana in Trentino.
context_section_description: The cave has a development of 3,600 meters (mostly horizontal), of which only the first 2 kilometers can be visited throughout the year; The rest of the cave is accessible only in periods of greatest drought and only to experienced and equipped staff.
  The cavity counts several caves, dug in the dolomite, with 11 ponds and a series of candle concretation stairs at the entrance of the cave. The cave has a depth of between + 250 and -130 m (380 meters in total).
  Among the wonders of this cave is a cave of 80 meters long, and a lake (the seventh: the "Pasa lake"), with a depth of 4 meters and a length of 40.
  Probably this cave is connected to the well-known Grotto of Bigonda, which is not far away. Together, the two cavities would form a large cavity complex.
  A layer of white clay lying in the cavity can suggest that the cave refers to the Riss glaciation, or 250,000 years ago.
  The cave has some areas that have been given a name for their peculiarities:
  the "mud branch", a blind branch of 150 m, where as the name suggests, it gets dirty to walk it
  the "labyrinth or swallow" spiral section forming a small labyrinth
  the "descent on the sand", a downhill walkway of about fifty feet that can be traveled by slipping into the sand
  the "black room" has a broad descending section with very dark stone
  the "tall branch" with entrance above the vault of the cave, reachable only with a ladder
  the "bathtub room" at the beginning of the cavity and characterized by planets of concaved tanks
  the "siphon of the echoes" term of the upper branch with a small aperture where you can hear an echo from the continuation of the cavity when shouting within it.
caption: The lake Pasa , one of the largest lakes in the cave
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