West Wind Provided Appealing Surface Conditions Key Largo. Discover Scuba Diving with Inst. Holly and photo dive guide DM Mike. Snorkeling guests guided by Inst. David this afternoon at N.N. Dry Rocks Reef and Horseshoe Reef. Captains Dave and John kept all safe topside on DEEPER. Fun Fish Fact of the day: Some fish like sharks don’t posses an air bladder. The air bladder helps keep them afloat. If they don’t have the air bladder they must swim continually or rest on the bottom.