- Scuba divers can use hand signals to communicate.
- They can also use underwater writing slates.
- They can use wireless and hard wired communication systems as well.A transducer on the diver’s face mask will converts his or her voice into an ultrasound signal. The other diver will have an ultrasound receiver that receives that signal and changes it back to a sound that the diver can understand.
The divers’ helmets, which have built in microphones and speakers, can be also linked to intercom stations, such as Clear-Com, on board the ship though an umbilical, enabling them to correspond with the Dive Supervisor and the crew on the deck.
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