Before revision: The lowest point underground is in the Veryovkina Cave in Abkhazia , where the altitude difference between the cave's entrance and the deepest explored point (the maximum depth) is , reached in 2019 by a Perovo-speleo team.
After revision: The lowest point underground is in the Veryovkina Cave in Georgia , where the altitude difference between the cave's entrance and the deepest explored point (the maximum depth) is , reached in 2019 by a Perovo-speleo team.