There was once an underground mine in Tuim, then it collapsed and in its place a lake of bright turquoise color with almost sheer edges was formed.

There was once an underground mine in Tuim, then it collapsed and in its place a lake of bright turquoise color with almost sheer edges was formed. It is partially fenced off, but constantly crumbles. There is also a bungee, but this is not for the faint of heart. They also organize speleological excursions into the bowels of an abandoned mine.