Are Smooth Hammerhead Sharks Found In the Waters Around Cozumel? At TopCozumelNews, we help Cozumel tourists plan their trips and activities using information collected on trips to the beautiful island. Cozumel is a large island in the Caribbean Sea and an idyllic cruise ship destination for scuba diving enthusiasts. Renowned for its impressive reefs and dive sites, Cozumel also provides visitors with ample opportunity to spot exotic marine life. The dusky shark is a species of ridgeback shark with a short, rounded snout and characteristic dusky pigmentation on its pectoral and second dorsal fin tips.