VIDEO: Terrifying Dive Into the Largest Saltwater Blue Hole in the World

Dean’s Blue Hole – It’s Closer than you Think This underwater sinkhole is the deepest known saltwater blue hole in the world. It’s surface area is roughly 100 feet wide, but at the base… it’s triple that at around 330 Continue reading VIDEO: Terrifying Dive Into the Largest Saltwater Blue Hole in the World