Check it out! Here's what the Blue Hole looks like shot from space! It's also considered to be one of most fatal diving spots on the planet (so I figured what better place to get my deep diving certification!).
"The Blue Hole is notorious for the number of diving fatalities which have occurred there earning it the sobriquet, "World's Most Dangerous Dive Site" and the nickname "Diver's Cemetery". The site is signposted by a sign that says "Blue hole: Easy entry". Accidents are frequently caused when divers attempt to find the tunnel through the reef (known as "The Arch") connecting the Blue Hole and open water at about 52 m depth. This is beyond the PADI recreational diving limit (40 m) and nitrogen narcosis begins to have an influence. Divers who miss the tunnel sometimes continue descending hoping to find the tunnel farther down and become increasingly narced."