The Pacific War Online Encyclopedia
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Cable ships were equipped to lay undersea telegraph cables. These remained important during Second World War, because atmospherics were still capable of interfering with the radio equipment of the day, and because telegraph cables offered secure communications so long as they were not physically accessible to the enemy for tapping. The failure of the Japanese to lay adequate cable networks between bases in their newly acquired empire meant they had to rely on radio, and this provided a wealth of traffic for Allied cryptanalysts to work on.
References
The Pacific War Online Encyclopedia (c) 2007-2008 by Kent G. Budge. Index
