Diver Gets Mouth Cleaned by Fish in Deep, Deadly Blue Hole

Diver Dominik Černý has shared footage from just outside a notorious submarine sinkhole showing a little fish cleaning the inside of his mouth. In a Reddit post, he said: "Under me were [a] few hundred meters of nothing and multiple dead divers at the bottom, but look at this lil guy cleaning my mouth."

The Blue Hole in Egypt's Red Sea is one of the deadliest places to dive in the world. Over 100 people—potentially up to 200—are thought to have perished there in the last two decades, and memorial stones are strewn around its edges.

The video shows Černý with his mouthpiece removed allowing a little bluestreak cleaner wrasse to do its job. "It was just for fun," he told Newsweek. "These little fish are known for their passion in cleaning other animals, they do this to even fish like moray eel and other predators. They are quite fearless.

"It was just light pinching. It is a little bit uncomfortable when it gets to your ear though."

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Dominik Černý in the Blue Hole in the Red Sea. The diving site is thought to be the deadliest in the world. Dominik Černý

According to the German website Der Spiegel, the Blue Hole is about 260 feet in diameter. Its walls are funnel shaped, with an opening at a depth of around 170 feet. At this point, an arch opens up to a sloping tunnel that leads to the open sea.

Why so many divers die there is somewhat unclear. "There aren't even any strong currents, quite the opposite actually. Why there is such a big amount of deaths is simply because some divers just go deeper than they should and that comes with huge risks," Černý said.

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In 2017, the Blue Hole and its risks were brought to the fore after Irish diver Stephen Keenan drowned at the site. According to the Guardian, he was overseeing an attempt by freediver Alessia Zecchini to cross the arch in a single breath. She got into trouble and he went to her aid. While she got out, he did not.

"From what I know, people die mostly by drowning, Černý said. "Freedivers…just go over their limit and faint, but with scuba divers, it usually starts with oxygen poisoning or nitrogen narcosis caused by such depth they are not equipped and don't have proper training for."

He said at the depth of the arch, divers can become confused and stop being cautious. This can result in them running out of air or having seizures.

"From what I have heard, [many of] the dead divers were not retrieved," Černý said. "The biggest reason why is depth."

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Memorial stones at the Red Sea Blue Hole. The stones are located about 60 feet from the entrance to the dive site. Dominik Černý

The inside of the Blue Hole is about 330 feet deep. On the sea side of the tunnel, the floor drops to around 3,300 feet. "Such huge depths aren't accessible for normal divers, and even though technical ones could dive 100 meters deep (330ft), it isn't easy to get [the divers] back. Down there it must be a very calm place anyway."

Černý, who has been diving for three years, said being underwater is like being in a different world.

"Everything works there so differently," he said. "I was astonished when at my first dive I looked up for the first time and realized there was 15 meters of water above me. If you think about it, it's quite a lot and I never realized it before then.

"Even though it is considered an 'extreme sport,' I have almost never been more relaxed than when I'm diving."