One of the deepest and most dangerous karst springs in the world (the second deepest in Europe). Explored down to -220 meters.
I have never dived there myself, but I monitored it for years as part of my university thesis, and I spoke several times with an expert cave diver who used to retrieve the sensor collecting my data at the entrance of the spring.
The water is always cold, and its colors range through every shade of green and blue.














