..But cave explorers like Vesley and Farr could not see the route and so could not anticipate the dangers, a partial list of which includes drowning, fatal falls, premature burial, asphyxiation, hypothermia, hurricane-force winds, electrocution, earthquake-induced collapses, poison gases and walls dripping with sulfuric or hydrochloric acid. There are also rabid bats, snakes, troglodytic scorpions…