Abkhazia, the breakaway republic of Georgia, is home to all four of the deepest known caves in the world, including Krubera Cave, once the deepest and now second to Veryovkina Cave, which, at 1.3 miles (2,212 meters) down, holds the record. When it was first documented in 1968, only 377 feet of it were charted, but since then, with additional expeditions, it has grown deeper and deeper. The entrance to this vertical cave system lies between two mountains—Fortress and Umbrella—in the Arabika Massif of the Western Caucasus. This remote place is…
