Easy access for a maximum of 10-15 meters!
Then a drop of about 3 meters is visible, followed by a shaft of about 20 meters!
For cavers only!
For the curious, there's a climb, followed by an awkward 30-meter ledge to bypass a lake, followed by a slide of about ten meters.
At the bottom, this is practically the end of the tunnel. Some have dug a little, but nothing has yet been found.