The Great Blue Hole is located in the Belize Barrier Reef Reserve System, about 60 miles away from Belize City and it is believed that this hole is the world’s largest sea-hole. Initial measured depth of Great Blue Hole was 125 m (410 ft) which is the most often cited depth up to this day. An expedition by the Cambrian Foundation in 1997 measured the hole's depth as 125 m (410 ft) at its deepest point. Breathing a mixture of nitrogen. oxygen and helium, expedition members were able to obtain rock. The ancient processes contributing to Belize atoll development may have begun as many as 70 million years ago and the atolls did not develop around subsiding volcanoes. Instead, they originated atop giant fault blocks; limestone covered ridges that settled in steps, providing a series of offshore platforms for coral growth. After the last ice age, with the slow rise of sea level, coral growth continued upward, creating the precipitous outer walls and the shallow inside lagoon that typifies these distinct formations. Many drop-offs surrounding the Belize atolls are thousands of feet deep, while depths in the shallow lagoons average 10 to 30 feet.
The Great Blue Hole is located in the Belize Barrier Reef Reserve System, about 60 miles away from Belize City and it is believed that this hole is the world’s largest sea-hole. Initial measured depth of Great Blue Hole was 125 m (410 ft) which is the most often cited depth up to this day. An expedition by the Cambrian Foundation in 1997 measured the hole's depth as 125 m (410 ft) at its deepest point. Breathing a mixture of nitrogen. oxygen and helium, expedition members were able to obtain rock. The ancient processes contributing to Belize atoll development may have begun as many as 70 million years ago and the atolls did not develop around subsiding volcanoes. Instead, they originated atop giant fault blocks; limestone covered ridges that settled in steps, providing a series of offshore platforms for coral growth. After the last ice age, with the slow rise of sea level, coral growth continued upward, creating the precipitous outer walls and the shallow inside lagoon that typifies these distinct formations. Many drop-offs surrounding the Belize atolls are thousands of feet deep, while depths in the shallow lagoons average 10 to 30 feet.
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