2 men die during Florida cave diving expedition; sheriff says they may have been aware of problems before going underwater

Two men drowned while on a diving expedition in a mazelike Florida cave system that extends deep below the surface, authorities said Thursday.

The Hernando County Sheriff's Office said three teenagers saw the two divers go into the Buford Springs Cave on Wednesday, but one surfaced and was floating unresponsively.

The teens swam over to check on him and received no response, officials said. They were able to get the diver over to the dock, but were unable to lift him out of the water.