Blue Sharks are cool! They live throughout the world's oceans, migrating from warm to cold seas and being truly pelagic, they spend their time hunting far from the coast. They feed of small fish and squid and can grow up to 3m in length. They also are highly qualified "surfers" as they use their pectoral fins to ride currents, therefore saving energy when covering long distances.
Check out one of Daan's videos, filmed at Cornwall, UK, where he has the pleasure of freediving with one of those magnificent fellas!