“There is no official list, but [Tarek] Omar [a local diver who recovers bodies] estimates that more than 130 divers have lost their lives in the hole in the last 15 years. He compares what is happening in the Blue Hole to the madness on Mount Everest.”
Spiegel profiles Egypt’s Gulf of Aqaba Blue Hole:
There are more attractive dive sites than the Blue Hole of Dahab, with more colorful corals, and more fish, shipwrecks, channels and caves. But the Blue Hole is considered to be most famous diving spot in the world — because it’s the most dangerous. …
The Blue Hole is easy to reach. It doesn’t take a boat to get there, and you don’t even have to swim out to it. You just hop in. It’s about 10 meters from a beach chair to the Blue Hole. The water is warm, there is no current and visibility is good.
Photo Gallery: “Compressed air can only be used to a depth of 56 meters. The tunnel’s exit is one meter lower than that.”