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    • Communications

    Underwater Communication Systems for Divers

    An underwater communication system links the diver to the surface supervisor for the duration of the dive, carrying voice in both directions alongside the breathing gas and depth monitoring. We supply diver comms for sale or hire, new or used, shipped worldwide door to door.

    Our range splits into hard-wire diver comms, where the audio line runs in the umbilical, and through-water diver comms, which work acoustically without a tether. We stock Amron AMCOM I, II and III communicators in one, two, three and four diver builds, rack and portable; OTS Aquacom intercoms, surface stations and Buddy Phone transceivers; PowerCom 25-watt four-channel units; and C-Tecnics diver radios. Earphone and microphone assemblies, comms rope and Fibron subsea comms cable complete the spread.

    Specifying starts with the dive mode. Tethered surface-supplied work takes hard-wire; free-swimming and bell backup take through-water. Diver count sets the channel count, and rack or portable follows the control station. For the panel the comms sits in, see our Control Panels and SRP range.

    Tell us the diver count, the dive mode and the helmets or masks in use, and we will specify a system and quote for supply or hire.

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    Frequently Asked Questions

    Hard-wire communication systems use a physical cable, typically integrated into the diver’s umbilical, to connect the diver directly to the surface supervisor. This method is incredibly reliable, offers crystal-clear audio, and is the standard requirement for tethered commercial diving operations. Through-water communications operate wirelessly using acoustic signals transmitted through the water. While highly useful for untethered submersibles or specific free-swimming tasks, acoustic signals can occasionally be disrupted by thermoclines, physical obstacles, or heavy background noise.

    Full-duplex systems allow both the diver and the surface supervisor to speak and listen simultaneously, much like a standard telephone call. This is a critical safety feature compared to simplex or “walkie-talkie” style systems where only one person can speak at a time. Full-duplex ensures that the supervisor can continuously monitor the diver’s breathing patterns for signs of stress or exhaustion. It also allows either party to instantly interrupt the conversation if a sudden underwater emergency occurs.

    A helium speech unscrambler is an essential piece of communication equipment used during deep saturation dives. When divers operate at extreme depths, they breathe a mixed gas called Heliox (a blend of helium and oxygen) to prevent nitrogen narcosis. Helium significantly increases the speed of sound, causing the diver’s voice to sound high-pitched and largely unintelligible. The unscrambler uses digital signal processing at the surface to lower the vocal frequencies in real-time. This restores the audio to a normal, understandable pitch, ensuring clear instructions can be given and received safely.

    Modern commercial diver communication systems are highly integrated pieces of equipment. They are frequently built directly into the main dive control panel or Scuba Replacement Package (SRP). This allows the dive supervisor to monitor air pressure, depth, and communications from a single, centralised station. These integrated systems typically feature dedicated audio output ports. This allows the dive operation to be recorded continuously, a practice that is often legally mandated for incident logging and post-dive safety reviews.

    Commercial diving is an inherently noisy environment. The sound of heavy underwater hydraulic tools, cavitation cleaners, welding equipment, and nearby ship thrusters can easily drown out a diver’s voice. To combat this, commercial communication systems utilise specialised noise-cancelling microphones located inside the diving helmet. Additionally, top-tier surface receiving units employ advanced digital signal processing (DSP) to actively filter out mechanical background noise while amplifying the human voice. This ensures commands remain clear even during heavy underwater construction tasks.