I recently came across The Blue Hole a series Monty Hall’s Dive Mysteries on YouTube. He has made 4 episodes the first is The Curse of the Blue Hole in the Red Sea which is a very famous dive site. The dive site is on the Sinai Peninsula which is a few kilometers north of Dahab.
This Blue Hole is a sinkhole that descends to about 100 meters, there is the saddle which is a shallow opening at 6 meters. There is also the Arch which is a 26-meter tunnel at a depth of 55 meters. The Arch is infamous as there have been a few diving fatalities due to its depth.
The dive site is now very popular with Freedivers as it offers the depth plus no current and direct access from the beach.
In 2016 New Zealand’s William Trubridge set a new world record for the deepest unassisted freediving, making it 102m down into the hole. The 36-year-old held his breath for four minutes 14 seconds as he descended into the depths.
How are the Blue Holes formed?
As we know our oceans are mysteries and many places we are yet to explore. Under the oceans lays many mountains, deep valleys and sinkholes. Sinkholes are formed in limestone and after years of erosion creating cracks and crevasses. Over a long time, perhaps centuries, water flow erodes the limestone and creates cracks, crevasses and caves leaving a void or an opening.