Divers explore Blue Hole Spring in Florida

Two divers exploring a the Blue Hole Spring in an underwater cave in Florida.

The footage shows the men swimming inside the cave and surfacing through the crystal clear water.

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''The spring produces crystal-clear water from the bottom of a 36-foot hole,'' the filmer later wrote online.

''Sun rays beam in from above through the blue water and strike the white sand bottom,'' he added.