Many long-time residents around the famed 663-feet-deep Dean’s Blue Hole in the Bahamas believe it was ‘dug by the devil’ and refuse to approach it for fear of death.

Dean’s Blue Hole, an underwater cavern, in the Bahamas may be popular with tourists and freedivers, but, according to a 60 Minutes report, many locals believe it was “dug by the devil.” 
Such underwater sinkhole formations are found elsewhere in the world, but, at a depth of 663 feet, Dean’s Blue Hole is the deepest known example, notes Atlas Obscura. 
Despite the stunning greenish-blue waters around it, CBS News notes that some of the long-time island residents “had never been to the blue hole, neither had their parents or their grandparents because they were scared.” 
They believe even approaching it “would lead to death.” 
Geologists attribute the hole’s formation to erosion.