If gas is not carefully planned the diver may lack sufficient gas for the decompression stops or run out of gas altogether.
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The main challenge is gas management because any delays or errors at this depth, plus the time to negotiate the horizontal section, will need more than a single tank of breathing gas to do safely. The Arch presents little problem for suitably equipped and competent technical divers. The ceiling of the Arch is 55 m (170 ft) deep, which requires suitable training and equipment as 40 metres is generally considered the limit for recreational diving. The Egyptian Chamber For Diving & Watersports (CDWS) now stations a policeman at the Blue Hole to ensure divers are diving with a certified guide who will make sure safety procedures are followed. This includes some snorkelling deaths at the surface unrelated to diving the Arch. The number of Blue Hole fatalities is not accurately recorded one source estimates 130 divers died during the fifteen-year period from 1997 to 2012, averaging over eight per year, another claims as many as 200. The Blue Hole itself is no more dangerous than any other Red Sea dive site but diving through the Arch, a submerged tunnel, which lies within the Blue Hole site, is an extreme dive that has resulted in many accidents and fatalities. Recreational divers do not get to see the Blue Hole arch when doing the Bells to Blue Hole dive.įatalities Memorial plaques for divers killed in the hole, left by families and friends at the site Technical diver passing under the Arch. The dive is then a wall dive that finishes by crossing the Blue Hole saddle at a depth of 7 m. At 26 m at the bottom of the Bells is a mini arch that should not be confused with the arch in the Blue Hole itself. The Bells entry is from the shore further along from the Blue Hole. Local dive centres take appropriately qualified divers to 30 m (AOW level or CMAS**) at the El Bells or Bells to Blue Hole sites. Since 1982 the Blue Hole has become very busy and is dived almost every day by recreational divers. During the dive, they noticed the underwater arch. In 1968 a group of Israeli divers led by Alex Shell were the first to dive the hole with modern scuba diving equipment. During the Israeli occupation, the Blue Hole developed a significant international reputation as a dive site. The Sinai Peninsula was occupied by Israel from the Six-Day War of 1967 until it was returned to Egypt by Israel under the Egypt–Israel peace treaty in 1979. The Blue Hole was historically avoided by Bedouin tribes people who inhabited the area. The reasons for why this site has such a high number of fatalities are not clearly understood.
The dive site is reputed to have the most diver fatalities in the world with estimates of between 130 and 200 fatalities in recent years. The Blue Hole is popular for freediving because of the depth directly accessible from shore and the lack of current. The hole and the surrounding area have an abundance of coral and reef fish. On the seaward side the floor drops steeply to over 1,000 metres (3,300 ft). There is a shallow opening to the sea around 6 m (20 feet) deep, known as "the saddle", and a 26 m (85 feet) long tunnel, known as "the Arch", whose ceiling is at a depth of 55 m (181 feet) and whose bottom falls away as it reaches the seaward side to about 120 m (394 feet). The Blue Hole is a submarine sinkhole, with a maximum depth within the hole of just over 100 m (328 feet). The Blue Hole is a diving location on the southeast Sinai, a few kilometres north of Dahab, Egypt on the coast of the Red Sea.
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