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In the Blue Hole - Dahab, Egypt, originally uploaded by Craig Grobler.

The Blue Hole is a diving location on east Sinai, a few kilometres north of Dahab, Egypt on the coast of the Red Sea.

The Blue Hole is a submarine pothole (a kind of cave), around 130m deep. There is a shallow opening around 6m deep, opening out to the sea and an 26m tunnel, known as the arch, the top of which is 52m. The hole itself and the surrounding area has an abundance of coral and reef fish.

The Blue Hole is notorious for the number of diving fatalities which have occurred there earning it the sobriquet, "World's Most Dangerous Dive Site" and the nickname "Diver's Cemetery". The site is signposted by a sign that says "Blue hole: Easy entry". Accidents are frequently caused when divers attempt to find the tunnel through the reef (known as "The Arch") connecting the Blue Hole and open water at about 52m depth. This is beyond the PADI recreational diving limit (40m) and nitrogen narcosis begins to have an influence. Divers who miss the tunnel sometimes continue descending hoping to find the tunnel farther down and become increasingly narcotised.

Dahab (دهب) is a small town situated on the southeast coast of the Sinai Peninsula in Egypt. Formerly a Bedouin fishing village, located approximately 80 km (50 miles) northeast of Sharm el-Sheikh, Dahab is still considered to be one of the Sinai's most treasured diving destinations. Following the Six Day War, the town was occupied by Israel and known in Hebrew as Di-Zahav, a place mentioned in the Exodus from Egypt. The Sinai Peninsula was restored to Egyptian rule in 1982. The arrival of international hotel chains and the establishment of other ancillary facilities has now made this a popular destination with tourists. The nearest international airport is located at Sharm el-Sheikh.

At least 23 people - including three foreigners - were killed and 62 wounded in three blasts in a terrorist attack in Dahab on 24th April 2006.