CNN Anderson Cooper 360 August 14, 2013 08:55:00
>> reporter: perhaps most striking to me is how appearances for the sinkhole are so misleading. a single people of sunlight reveals the cavern is even bigger below the water line, with passageways carved deep into the darkness. but most disturbing could be the view from up top. the round opening 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 there? >> correct. it is that random and that sudden. and it could happen obviously overnight or at any time. >> reporter: it can, and it does. with thousand...