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Photographer Martin Strmiska dived the Slovak Opal Mines, which has many tunnels, shafts and adits excavated in the volcanic hills. Five lowest levels are flooded, offering an incredible experience when diving in completely crystal clear water.(Photo/IC)
Photographer Martin Strmiska dived the Slovak Opal Mines, which has many tunnels, shafts and adits excavated in the volcanic hills. Five lowest levels are flooded, offering an incredible experience when diving in completely crystal clear water.(Photo/IC)
Photographer Martin Strmiska dived the Slovak Opal Mines, which has many tunnels, shafts and adits excavated in the volcanic hills. Five lowest levels are flooded, offering an incredible experience when diving in completely crystal clear water.(Photo/IC)
