Mysterious Underground Pool Lingers Below Lake

If you thought climbing into a cave was quite the risk, imagine a cave with an existing pool of water and then another lake directly above it on the surface. This is no made up fantasy but a real life sight to behold on Owey Island in Ireland. Iain Miller of Unique Ascent climbs below the surface to boat across the underground water. He is the only person inside, filming all his own footage.