so the water is constantly going up and down, depending on drought or hurricane. right. reporter: it is easy to see how the groundwater has silently wreaked havoc. i pass by limestone boulders as big as cars sitting on the bottom, and these forces are still at work, compounded by the demand for fresh water. it is progressively dropping yearly, and that s basically over the whole state of florida. the aquifer is getting lower and lower. reporter: perhaps most striking to me, how appearances of the sinkhole are so misleading. a single beam of sunlight reveals the kanch is below the water line with passage ways carved deep into the darkness. most disturbing could be the view from up top, the round opening deceptively small, little indication of the cavern
about this sinkhole, it s easy to get inside. called the devil s den, it s open to tourists for viewing and diving. and dive instructioner prince johnson takes me under for a look. i find that this seemingly placid pool of water is anything but. the water has gone down considerably because of the aquifer, but it s also risen when we ve had hurricanes and tropical storms, it s risen another 45 feet. reporter: 45 feet? 45 feet. reporter: down here it s easy to see how fluctuating ground water has wreaked havoc. i pass by limestone boulders as big as cars sitting on the bottom. and these same forces are still at work, compounded by the demand for fresh water. it is progressively dropping yearly. that s basically over the whole state of florida. the aquifer is getting lower and lower.
of water is anything but. the water has gone down considerably because of the aqua and risen because of hurricanes and tropical storms it s risen another 45 feet. reporter: 45 feet? 45 feet. reporter: so the water is going up and down. yeah. reporter: depending on trout and hurricanes? correct. reporter: how ground water silently reeked havoc. i passed by limestone boulders as big as cars on the bottom and the same forces at work compounded by the demand for fresh water. it is progressively dropping yearly, and that s basically over the whole state of florida. aquafor is getting lower and lower. reporter: most striking to me, how appearances are so misleading. a single beam reveals the cav vern is bigger below the water line with tunnels and passage
another 45 feet. reporter: 45 feet? 45 feet. reporter: so the water is constantly going up and down depending on drought and hurricane. right. reporter: down here it s easy to see how fluctuating ground water has silently wreaked havoc. i passed by limestone boulders as big as cars sitting on the bottom. these same forces are still at work, compounded by the demand for fresh water. it is progressively dropping yearly. and that s basically over the whole state of florida. an aquifer is getting lower and lower. reporter: perhaps most striking to me, how appearances of this sinkhole are so misleading. a single beam of sunlight reveals the cavern is even bigger below the water line, with tunnels and passageways carved deep into the darkness. but most disturbing could be the view from up top. the round open is deceptively small. little indication of the cavern that s just beneath my feet. until a hole like this opens up, there s really no warning, is