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Why don't Submarines use Radio or GPS?

If you have seen almost any old movie that had a submarine in it, you probably saw the crew using radios to communicate with headquarters even when deep underwater. Unfortunately, its not that way in real life. In this video we do a simple experiment with a cell phone to see how radio waves are blocked from it even under under less than an inch of water. And we look at why this happens and how real subs use acoustic, light, and extremely low frequency radio waves to communication with shore.