Bolton Strid

River Wharf in Yorkshire, England is 30-feet across with frothing currents and waves, but downstream at around Bolton Abbey it suddenly turns into a rather calm creek just a few feet wide. Water doesn’t disappear anywhere but the whole river changes orientation. Waters begin to flow vertically in the tight shaft created by the natural rock. The stream hosts multiple underwater cave systems and dangerous currents below the surface. No person who has fallen into the Strid has ever come out of it alive and its underwater geology is still unexplored.