Scientists are saying the cold weather completely killed much of the coral extending from Key Largo through the Dry Tortugas islands west of Key West. Divers assessing the coral last week were looking for bleaching – a tell-tale sign that the ocean life has been damaged, but what they found was even more devastating. The corals didn't even have a chance to bleach. They just went straight to dead. Divers from the Florida Keys National Marine Sanctuary are calling the situation an “ecosystem-wide mortality."