Grotta dell'acqua nera

The large entrance hall of this cave hides a deep and dark mouth, filled by an underground stream that is always well-fed, even in periods of drought: it is the access - reserved for cave divers - to a vast and intricate network of cavities in the bowels of the mountain.
The water is actually clear, and it is thought that the toponym derives from the dark moss-covered bottom, on which the stream flows outside before flowing into the Senaiga.Due to the complex morphology of the cave and the technical difficulties, it has only been explored since the 1970s, and so far cave divers have discovered a development of 1600 meters, between siphons and difficult passages.
In the 1930s it was proven, with the injection of dyes, that this cave is in communication with the Castello Tesino Caves, a few kilometers away; furthermore, the examination of the fine sand found inside, rich in granite crystals, testifies to an important contribution of water coming even from the Cima d'Asta group, much higher up and much further away!