Comment Re:Google map it (Score 2, Informative) 560
I doubt that, from what I can tell this radio transmission uses AM high frequency. MF/HF (which are used by this and other typical radio broadcasts) won't travel that much through water. For communication with submarines VLF and ELF is used as it has decent penetration, plus because of the very low transmission rates (data rates) that can be achieved audio/voice transmission isn't possible so they have to rely on simple text messages.
See this as an example.
See this as an example.