Divers underwater enjoy the silence of the sea.. and hear only their breathing & bubbles and only the sound of marine traffic nearby.
Having said that, today’s technologies allow divers to speak to each other underwater in certain scenarios using full-face masks and communications, but it’s highly unlikely you would be using some of these unless you are doing specific underwater work (therefore, not diving recreationally.
But sometimes you still need to communicate somehow… and for this, the below are some ways of communicating using hand signals.