15-12-2013, 05:54 PM
Not so modern as you think, try SOSUS.
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Underwater signalling
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Underwater signalling - by Radio Fixer - 15-12-2013, 08:59 AM
RE: Underwater signalling - by ed731pdh - 15-12-2013, 10:22 AM
RE: Underwater signalling - by Radio Fixer - 15-12-2013, 12:12 PM
RE: Underwater signalling - by Refugee - 15-12-2013, 01:45 PM
RE: Underwater signalling - by ed731pdh - 15-12-2013, 05:54 PM
RE: Underwater signalling - by Refugee - 15-12-2013, 06:36 PM
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