The folks at BAE have done what can only be described as a cool hack... sending data through a 3 inch thick steel wall, "wirelessly".
It's not radio, as you probably already guessed.... it uses acoustic transmission, which is a really neat idea.
More coverage at http://www.engadget.com/2010/07/21/uk-defense-firm-pumps-data-through-solid-submarine-walls
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