Blue Hole, Belize
Photograph by David Doubilet, National Geographic
Sinkholes can happen anywhere water can erode a vertical channel that connects to a horizontal drain, a situation that allows a column of solid material to wash away, Missouri State’s Gouzie explained.
If the sinkhole is near the sea—or in the sea, as with the famous Blue Hole in Lighthouse Reef off the coast of Belize—seawater can quickly seep in after a collapse, forming a deep pool.
Maggie Gyllenhaal and Peter Sarsgaard