Devils Hole, Nevada
Devils Hole is part of Death Valley National Park and is home to one of the most endangered fish in the world – the Devils Hole Pupfish. Devils Hole is a geothermal pool that measures over 500 feet deep, but due to its complex structure of caves that branch out, its bottom has never been mapped.
In 1965, four young men ventured into the depths of Devils Hole with diving equipment; only two returned, the others perishing in the murky water. Although military personnel and experienced divers converged upon Devils Hole in the coming days, their bodies were never recovered, demonstrating how treacherous and foreboding Devils Hole is.