Final answer:
Commercial SCUBA divers commonly use full-face masks with communication units linked to an intercom system. Hand signals and underwater writing or electronic devices are additional communication methods. Divers monitor their air supply through pressure gauges, and slow ascents with decompression stops are necessary to prevent DCS.
Step-by-step explanation:
Underwater Communication in Commercial SCUBA Diving
In commercial SCUBA diving, communication between divers is crucial for operational efficiency and safety. Unlike recreational diving where hand signals or writing slates might suffice, commercial divers often rely on more advanced systems. The primary method of communication is through full-face masks equipped with communication units, which enable divers to speak to each other and to surface personnel. These masks are connected to an intercom system, often through a wired connection. Divers can thus relay important information, report issues, and coordinate tasks effectively under water.
Another form of communication used by commercial divers is through hand signals for basic, pre-agreed messages. These are especially useful as backup communication methods in the event of equipment failure. For longer or more complex operations, divers are equipped with underwater writing boards, tablet computers enclosed in waterproof cases, or even underwater sign language to convey messages.
Additionally, understanding the duration of air supply is essential for every diver. Scuba tanks come with pressure gauges that provide accurate readings of the gas levels. Divers, with their knowledge of gas behavior under pressure, can estimate their remaining dive time to prevent running out of air.
It is vital that divers also adhere to procedures to avoid decompression sickness (DCS). Ascending slowly, making decompression stops, and, when necessary, treatment in hyperbaric oxygen therapy chambers are some of the preventative measures practiced.