What communication form should divers use underwater?

Divers should use body language, gestures, and predefined hand signals for underwater communication because verbal commands are often ineffective due to the inability to hear clearly and the distortion of sound underwater. Electronic devices such as underwater communication systems can be useful but may not always be available or reliable in every situation. Body language and gestures allow for immediate, clear communication between divers without the need for equipment. Predefined hand signals are established within the diving community to convey important information, warnings, or instructions, ensuring that messages are understood quickly and accurately even in challenging conditions. This method of communication maximizes safety and cooperation during dives, which is essential for managing potential underwater emergencies and coordinating activities effectively.