FLEXIBLE 2"" WATER LINE FROZE GOING INTO THE MINE. IT WAS BROUGHT TO THE SHOP TO UNFREEZE. WHEN ICE STARTED MELTING, AIR PRESSURE WAS APPLIED TO THE HOSE TO HELP REMOVE THE ICE. WHEN THE LAST O F THE ICE CAME OUT IT RELEASED THE AIR PRESSURE WHICH MADE THE HOSE KICK BACK HITTING EE IN THE FOREHEAD AND NOSE. BROKE NOSE AND SEVERE BRUISING.