The below description is taken from LEGO.com.
Deep Sea Diver
"Blub blurb glub?"
The Deep Sea Diver seems like a nice enough fellow, but no one can tell for sure, because no one can understand what he's saying. Whenever he speaks, all that comes out is burbles and bubbles. He might be easier to understand if he ever took off his diving mask and air tank, but he thinks that he can't breathe without them and always keeps them on, even when he's walking around on land - which is a pretty funny sight, thanks to those big flippers on his feet!
The Deep Sea Diver loves the water and can often be found swimming around in fish tanks and bathtubs, hoping to spot rare and exotic fish. He loves to tell stories about his amazing undersea adventures, but of course it's impossible to guess what he's actually talking about. His gestures and sound effects certainly make it all sound very exciting, though!