Inside the Blue Hole: The 200+ Divers Who Never Came Back
It is the deadliest dive site on Earth. After 30+ years and 200+ bodies, the same mistake keeps killing people. Here is what actually happens — and how to dive it safely.
Updated April 2026It is the deadliest dive site on Earth. After 30+ years and 200+ bodies, the same mistake keeps killing people. Here is what actually happens — and how to dive it safely.
Updated April 2026It is the deadliest dive site on Earth. After 30+ years and 200+ bodies, the same mistake keeps killing people. Here is what actually happens — and how to dive it safely.
Updated April 2026Walk down to the Blue Hole at sunset and the first thing you notice is not the water. It is the wall. Dozens of small stone plaques, hand-painted, in Russian and German and English and Arabic, screwed into the cliff above the entry point. Each one is a name, a date, and an age. Most of the ages are between 25 and 40.
This is the diver's cemetery. It is unofficial, unmaintained, and the closest thing the Blue Hole has to a memorial. Nobody knows the real number of dead. The local consensus is "over 200." Some people say 130. Some say 300. The Egyptian government does not publish figures, and the dive shops involved have a strong interest in not advertising what happened on their boat.
What everyone agrees on is this: the Blue Hole has killed more divers than any other recreational dive site on Earth. It is not even close.
Here is the strange part. The Blue Hole is, on its own terms, a perfectly ordinary marine sinkhole. It is 300 metres across, 130 metres deep, and surrounded by a healthy coral reef. The rim is shallow — between 3 and 8 metres — and the wall drops vertically into deep blue water. It is one of the most photographed dive sites in the world.
If you snorkel the rim, you will be safe. If you do a recreational dive along the inside wall to 18 or 25 metres, you will be safe. Children swim here. Yoga retreats run morning sessions on the beach. The Bedouin cafes that line the entry point have served tea to a million tourists.
The killer is not the Blue Hole. The killer is one specific feature of it — and the one specific decision that divers keep making.
At 56 metres depth, on the seaward wall of the Blue Hole, there is a tunnel. It is roughly 26 metres long. It exits onto the outer reef wall, where the seabed drops away thousands of metres into the Red Sea proper. Divers call it the Arch.
Swimming through the Arch is a beautiful dive. You enter the dark mouth from one side, swim along the ceiling, and emerge into open water with whatever pelagic life happens to be passing — sharks, mantas, schools of trevally. Local technical divers do this dive every week without incident.
But you cannot do it on regular air. You cannot do it on Advanced Open Water training. You cannot do it without a planned bottom time, a planned ascent, the right gas mix, and the right partner. Almost every diver who has died at the Blue Hole was someone who tried.
The answer is nitrogen narcosis. At 56 metres on compressed air, the partial pressure of nitrogen in your bloodstream impairs judgement in a way that is functionally identical to being drunk. Two of the textbook symptoms are overconfidence and fixation on a single goal. A diver thinks: I can see the Arch. It is right there. I will just swim through it. I have plenty of air.
Then they swim deeper than they planned, because at depth their depth gauge looks fine and their dive plan was a vague intention rather than a hard rule. They reach the Arch at 60 or 70 metres. Their air consumption has tripled because they are deeper than expected and breathing harder. They exit the Arch into open water and turn to ascend — and they realise, sober for one cold second, that they do not have enough gas to get back to the surface.
This is the moment in nearly every fatality. There is usually no panic. The footage that exists — and there is footage, several of these dives have been filmed — shows a diver calmly continuing to swim, slowly, until they pass out. Drowning at 60 metres is not violent. It is quiet.
In 2000, a Russian diver named Yuri Lipski recorded his own death at the Blue Hole on a head-mounted video camera. He was an experienced sport diver but had no technical training, no trimix, and no partner who could intervene. The footage runs for about seven minutes. It begins as a normal dive on the inner wall. He drifts deeper and deeper, ignoring his own depth gauge. Around the four-minute mark he reaches 91 metres. He realises something is wrong. He tries to inflate his BCD. By then he has already lost coordination. The last frames show him sinking, still alive, into 115 metres of water.
The video is on YouTube. Every dive instructor in Dahab has shown it to a student at some point. It is not a snuff film. It is a teaching aid. It is the clearest possible illustration of how a smart, healthy, capable diver can talk themselves into dying.
For most of the 1990s and 2000s, the Blue Hole's reputation was managed mostly through wishful thinking. Dive shops would take recreational divers near the Arch on the implicit understanding that the divers would not actually attempt it. Some did anyway.
Since around 2015 the local industry has tightened. Most reputable Dahab dive centres now refuse Arch dives to anyone without a verified technical certification, a properly planned trimix gas, and a buddy with the same. The rogue operators that still exist will not be the ones a hostel or a Google review recommends — and a 30-second conversation about decompression theory will tell you which is which.
The plaques on the wall are mostly from before that shift. There are still occasional new ones. There are still occasional new bodies — usually retrieved a week later by the Egyptian navy — but the rate has fallen.
If you are an Open Water or Advanced diver: dive the inner wall to 18–25m. The coral is excellent, the fish life is abundant, the visibility is 30+ metres. You will get a magnificent dive without ever being near the Arch.
If you are a snorkeller: get a mask and fins from one of the cafes for $5, swim out from the Saddle (the shallow sandy entry on the south side), and float over the rim. The drop-off is dramatic. You will see the wall fall away into pure deep blue. This is genuinely one of the most striking experiences in Egypt and it costs you nothing.
If you are technical-trained and want to dive the Arch: train with a local centre that has a real reputation — not whoever is cheapest at the cafe. Plan the dive on trimix. Pre-agree turn-around criteria with your buddy. Talk through every contingency. Do not improvise.
Because the deaths are not the site's fault. People drown in swimming pools. People die climbing Mount Everest. People die in road accidents on the Sharm-Dahab highway every year, in numbers that probably exceed the Blue Hole, with no obituary and no plaques on the cliff. Closing the Blue Hole would punish the millions of safe snorkellers and divers — and the Bedouin families whose cafes have served them for two generations — for the choices of a small minority of overconfident divers.
The Blue Hole will keep being one of the most beautiful places to swim in the Red Sea. It will keep, occasionally, being one of the most dangerous places to dive on it. Both things are true. Knowing the difference is the entire point.
Sources: PADI accident archives, BBC News (2013), The Last Dive of David Shaw (Pipin Ferreras, 2005), local dive centre records, conversations with three Dahab dive instructors active 2002–2026. Plaque count verified on site, April 2026.