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The initial measured depth of the Great Blue Hole was about 125 m (410 ft) which is the most often cited depth up to this day. An expedition was conducted in the summer of 1997 to collect core samples from the Blue Hole's floor and document the cave system. [6]
The diameter of the top entrance ranges typically from 25–35 metres (82–115 ft) (Dean's Blue Hole) to 300 metres (980 ft) (Great Blue Hole in Belize). The overall largest blue hole (taking into account depth and width) is located 100 kilometers from the coast of Belize. The Great Blue Hole is a massive 300 meters wide and 125 meters deep. [5]
The Blue Hole is a submarine sinkhole, with a maximum depth within the hole of just over 100 m (328 feet). 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 ...
‘Blue hole’ is largest ever discovered at 1.3K feet deep — and scientists haven’t reached the bottom yet ... scientists were unable to gauge TBJH’s maximum depth as the cable was halted ...
The Great Blue Hole in Belize was declared by Jacques Cousteau to be one of the top five dive sites in the world. Discovery Channel referred to it as one of the ten most amazing places on earth.
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The Great Blue Hole, a giant submarine sinkhole, near Ambergris Caye, Belize. The following is a list of sinkholes, blue holes, dolines, crown holes, cenotes, and pit caves. A sinkhole is a depression or hole in the ground caused by some form of collapse of the surface layer.
Dean's Blue Hole is the third-deepest blue hole in the world, with a depth of 663 feet.