![]() ![]() Other techniques that have been used include sonar and blue lasers. A few nations have built transmitters which use extremely low frequency (ELF) radio waves, which can penetrate seawater to reach submarines at operating depths, but these require huge antennas. Very low frequency (VLF) radio waves can penetrate seawater just over one hundred feet (30 metres), and many navies use powerful shore VLF transmitters for submarine communications. Transmitting messages to these submarines is an active area of research. In the event of a nuclear war, submerged ballistic missile submarines have to be ordered quickly to launch their missiles. ![]() During the Cold War, however, nuclear-powered submarines were developed that could stay submerged for months. Early submarines during World War II mostly travelled on the surface because of their limited underwater speed and endurance, and dived mainly to evade immediate threats or for stealthy approach to their targets. Submarines can surface and raise an antenna above the sea level, or float a tethered buoy carrying an antenna, then use ordinary radio transmissions, however this makes them vulnerable to detection by anti-submarine warfare forces. Because radio waves do not travel well through good electrical conductors like salt water, submerged submarines are cut off from radio communication with their command authorities at ordinary radio frequencies. JSTOR ( December 2008) ( Learn how and when to remove this template message)Ĭommunication with submarines is a field within military communications that presents technical challenges and requires specialized technology.Unsourced material may be challenged and removed.įind sources: "Communication with submarines" – news Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification. ![]()
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