A dolphin has apparently sought help from a diver to be freed from a fishing hook. Video footage shows how diver Keller Laros helped out the mammal, which had a hook stuck in its dorsal fin. The ...

When scuba divers need to say 'I'm okay' or 'Shark!' to their dive partners, they use hand signals to communicate visually. But sometimes these movements are difficult to see. Now, researchers have ...