Wurm42 t1_iu6obqj wrote
Reply to comment by BrokenEye3 in TIL that in 1968 the US Navy proposed turning 2/5ths of Wisconsin into a giant underground radio antenna so orders could still be sent to submarines following a nuclear attack on America by DeadForDecember
The extremely-low frequency (ELF) array the Navy eventually built could be used to reach surface ships or land forces as well, but there were easier, more effective ways to communicate with everything but submarines.
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