The Great Blue Hole aerial view, boat in center
During Jacques-Yves Cousteau's 1972 expedition, the initially measured depth of the Great Blue Hole was 410 feet, which has remained as an often cited measurement ever since. Another expedition led by the Cambrian Foundation in 1997 would measure the hole’s depth as being 407 feet at its deepest point. 100 percent accurate measurement of such great depths in such intricate places is quite challenging.
Photograph by Astrum Helicopters
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