The spring itself is over 310 feet deep, one of the deepest in the United States. This gives it a vivid blue color that one must see to believe.
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Blue Springs is an amazing crystal clear spring in Central Florida with a Cave going down to 117ft. The run is about 10ft deep and is full of life from Manatees to fresh water turtles and lots of fish.
At 2,223 meters (7,257 ft) deep, it is the deepest-known cave on Earth. Veryovkina is in the Arabika Massif, in the Gagra mountain range of the Western Caucasus, on the pass between the Krepost and Zont mountains, close to the slopes of Mount Krepost. Its entrance is 2,285 metres (7,497 ft) above sea level.
Like scuba divers who drive ten hours to get here, we know it's the crystalline water that draws them in. Visibility is an astonishing 100' due to the fact that the water completely renews itself every six hours—it's truly never the same lake twice.
Welcome to Madison Blue Spring State ParkThis crystal-clear, first-magnitude spring is a popular spot for swimming and cave diving. About 82 feet wide and 25 feet deep, the spring bubbles up into a limestone basin along the west bank of the Withlacoochee River.
Blue holes, physically, are hazardous due to their structure and depth. Their surrounding walls cause bad water circulation, meaning the water is generally depleted of oxygen.
The hole is perfectly circular in shape, over 300 meters (1000 ft) across, 3140 feet circumference and 125 meters (410 ft) deep. It was formed as a limestone cave system during the last glacial period when the sea level was 400 to 500 feet below present time and was dry land.
Believed to be the world's largest feature of its kind, the Great Blue Hole is part of the larger Belize Barrier Reef Reserve System, a World Heritage site of the United Nations Educational, Scientific and Cultural Organization (UNESCO).
Krubera Cave (also known as Voronya Cave), in Abkhazia, Georgia is the deepest known cave in the world at present at over 2000 metres/6561 feet but the cave is very cold, with temperatures of 1.0 C at 100 metres depth, rising slowly up to 7.2 C at 2000 m depth.
I crawled for 10 hours through the most claustrophobic cave in the world, Ogof Y Daren Cilau, which is home to one of the tightest squeezes known, 'The Vice'. The deeper you go into the cave, the tighter it becomes.