ExtreSituated a few miles outside the town of Dahab on the Sinai Peninsular, The Blue Hole is a natural coral feature and considered to be a world class diving site. It is also the site that has seen the deaths of over 100 divers - more than any other diving stie.
Essentially The Blue Hole is a small coral lagoon which starts near the surface and drops down to a stunning arch which leads out to the main reef wall. At its deepest part, the Blue Hole reaches over 120m. me ironing at new world record depth of 137m.
Popular with tourist divers, its great depths have also seen the deaths of more than 70 divers.
Our team of UK divers wanted to explore, map and video the Blue Hole both to investigate why there has been such a loss of life and to record the present conditions.
Although the shallower sections of the Blue Hole offer easy diving conditions, in order to explore the deeper regions it was necessary to use mixed gases to conduct dives between 60-105m. The team used a combination of open circuit trimix and Inspiration rebreathers which gave the advantages of gas efficiency allowing for extended bottom times.

The logistics of obtaining boats and sonar equipment in the area meant that the mapping was done by the divers. We used handheld underwater sonar and compasses to take key measurements to create the map. We also shot video and stills pictures of the Blue Hole to add to the information that we collected.

http://www.blueholeproject.com/

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