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Blue hole (Red sea)

This term has other meanings, see Blue hole (values).
Blue hole (from the English. Blue Hole is an underwater vertical cave near Dahab in Egypt.

It is surrounded by coral reefs karst sinkhole depth of about 130 meters. From a depth of 52-55 meters, the cave is connected to the sea by a passage. Overhanging over the passage corals formed a kind of arch, hence the name of the Arch.

The traditional route for Amateur divers consists of diving through the Bells (200 m North of the Blue hole), moving along the reef wall and entering the Blue hole through the upper isthmus called the Saddle of the Arch (at a depth of 6-7 meters). Passing through the Blue hole along the chord or along the wall, you can get out of the water. Thus, familiarity with this dive site does not require dives deeper than 20-30 meters.
Memorial 28°34 ‘ 23 “s. W. 34°32’17” W. d. HGYAO
The Blue hole’s notoriety was created by irresponsible divers who performed dives in this place without sufficient qualifications and without appropriate equipment. The deceptive simplicity of passing an Arch with a single balloon with recreational equipment often leads to a sad ending. The reason for this is nitrogen anesthesia and depletion of the air supply during ascent. A memorial has been created on the shore in memory of the divers who died in the Blue hole. However, due to the large number of such divers, they stopped putting “signs” with the names of the dead, as this deters tourists.

The blue hole is an ideal place for experienced technical divers to dive. Easy access to the water, no waves on the surface and currents under water. In the center of the Blue hole, the depth is about 80 meters, further down the slope 100 meters and at the exit from the Arch-135 meters.

In addition, freedivers dive here to this day.

Among the divers who overcame the Arch in freediving mode on one breath: William Trubridge (New Zealand) — without auxiliary means (flippers, monofin, cargo), Herbert nietzsch (Austria), Bivin (South Africa), Natalia Molchanova and her son Alexey, Sychev Eugene, Shmatko Yuri (Russia), Alexander Bubenchikov (Ukraine), Konstantin Novikov (Russia). Natalia Molchanova is the first and only woman in the world today who made the passage of the arch in one breath[1].

Infrastructure on the shore
There is considerable Parking space for cars and buses on the beach. There are several cafes and shops with Souvenirs, as well as a toilet (paid). Almost all the cafes and living rooms in the attic of several floors belong to the Bedouins, partly to the nomadic tribal population of the desert of Egypt.

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