Fix Under Water Sounds

I find Aquatic Dinos... So all those who can dive, when they are under water, should not make noise.
Because it's really impossible to sneak up as a sarco or spino, sucho, when someone is drinking at the water.

Above water I understand it perfectly. But underwater, they shouldn't be able to make any noise while swimming.

You don't hear fish underwater either.

Furthermore, it should be set times the dinos that are under water also maintain the height in which they dive and stand on the spot. Only the Sarco remains to my knowledge at the same height. The Spino and Sucho, gradually sink further and further.