Sinkholes are formed by rainwater seeping into the ground, and this acidic water dissolving the limestone. Take a look inside a big one in Florida.
Sinkholes have existed in Florida for millennia. Devil’s Den is one such sinkhole that is much larger than what is seen from the hole at the surface. In fact, the water has risen to over 40 feet at one point. Most sinkholes are actually close to the surface – within 10 to 12 feet to the ground we stand on. Thousands of sinkholes have been found throughout Florida, and more continue to be found every year.