How do you communicate directly with a sub under water? You use very low frequency RF 15-30 kHz and LOTS of power (1MW). I live 20 miles from one of these Navy transmitters (Jim Creek, WA) and had the pleasure to tour it once with a hamfest group in the 1980s. I worked in a TV station so was used to broadcast sized transmitters but was still in awe at antenna tuner coils that you could stand up inside of. They wouldn't let us take pictures since it was an active site but here are some links from around the web of virtual tours, pictures, etc:
Yosami Japan VLF station using mechanical generators
Jim Creek,WA virtual tour
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