The Sharks Are Roaring

Uh, not to spoil all the fun of the many, many fans of this sequel that was in no way forgotten, and certainly not at ALL unprofitable for everyone involved in its production... but WHY are the damned Sharks hissing and growling and making all sorts of threatening vocalizations UNDERWATER, where there is no air for use in the vocal chords they do not have??

I ask only because it's absolutely ####ing ridiculous, is all.

...Really, people! was the director THAT strapped for respect of the human beings who didn't show up to see his little opus? were the massive, (poorly) computer rendered deadly, deadly apex predators FOR REAL so un-thrilling that they needed voices?

again I ask only because ITS ####ING FLIES IN THE BREATHING MOUTH RIDICULOUS, is all. And then she punches the thing in the nose (which experts DO say is what one ought to do, when faced with a shark many times your size), and rides it's dorsal fin to safety (which is not quite as recommended.) Also not recommended?? gunning a motorcycle at a hundred and fifty miles an hour across the Great Wall of China. There's usually a couple tourists around there, and you risk startling them.