Deep-water soloing (DWS), also known as psicobloc, is a form of solo rock climbing that relies solely upon the presence of water at the base of a climb to protect against injury from falls from the generally high-difficulty routes. While typically practiced on sea cliffs at high tide, it can also be done on climbs above reservoirs, rivers, and even swimming pools. Often a dinghy or other small boat is kept on scene to pick up the fallen climber, as a fall from a taller route can still pose the risk of being knocked unconscious on impact with the water, which could lead to drowning.