Krubera Karst Cave
Natural Feature
For several decades, the world’s deepest-known caves were considered to be in France with the length deep into the ground up to 1,600 meters. However, in 1960, Georgian speleologist made the first exploration of a karst cave in Abkhazia’s Arabika Massif, at the depth of 95 meters, and named after Alexander Kruber, the famous researcher of geography and speleology. In 2007, another group of speleologists expanded the area and went down to 2,191 meters. However, five years later, in 2012, the cave was explored again by Ukrainian speleologists who managed to go down to 2,197 meters underground. Today, Krubera cave is the most in-depth known underground space on earth.