The resurgence pool at Porth Yr Ogof (Wales) is another innocuous looking stretch of water in Britain with a sad tally of deaths associated: http://www.ogof.org

The resurgence pool at Porth Yr Ogof (Wales) is another innocuous looking stretch of water in Britain with a sad tally of deaths associated: http://www.ogof.org.uk/porth-yr-ogof.html http://www.ogof.org.uk/porth-yr-ogof.html 'Another sinister danger in this cave is the resurgence pool, where the water leaving the cave is forced through a narrow passage, in doing so it has scoured out a 7 m deep pool with underwater ledges, this coupled with the strong undercurrents created by the flow of the water has made this the most dangerous location in any British cave. In this short section of cave 10 people have drowned all within the sight of daylight, the dangers here should not be underestimated, signs in the cave before the pool warn of the danger and direct you to alternative exits.'