web: https://www.rumchalpa.cz/ Czech quarry, max depth is 18m Attractions: Bus under water, some platos (marked by lines)... web: https://www.rumchalpa.cz/ Czech quarry, max depth is 18m Attractions: Bus under water, some platos (marked by lines) Visibility according to year period - from 1-8m (during winter more) Service: tank filling, friendly staff