The submersible radio is a portable voice communications device. It generally uses VHF or UHF frequencies. It is distinguished by the fact that it meets IP 68 standards. This requires the radio to continue working even after 30 minutes at one meter below the surface.
The submersible radio is used by crew members a long way from one another. This type of device is not capable of underwater communications.
The submersible radio uses different frequencies, depending on whether it is a VHF or UHF model.
Choice will depend on the radio's resistance to submersion. Some remain functional even after an hour at five meters' depth.