deepest hole in the world
1. Deanâs Blue Hole: Long Island, Bahamas. Â© digitalunderwater.com / Alamy. At more than 650 feet deep, Deanâs Blue Hole is the worldâs deepest sinkhole with an entrance below water. Located in a bay near Clarence Town on the Bahamasâ Long Island, its visible diameter is roughly 82â115 feet.