In the mountains above the small village of Tuna Hästberg located about 3 hours from Stockholm, Sweden’s capital and nearby to the bigger towns of Borlänge and Ludvika. Deep beneath the earth’s crust lies a unique and different world, miles of tunnels with crystal clear and cold water.

Tuna Hästberg is a disused iron mine . Mining activities were halted in the late 1960’s and since have left many miles of shafts to be water filled.....