There's no video for it, but I don't know what exactly is the problem. Get in the submarine, sit in the empty chair if you want, then listen to the sonar and watch the background through the window (or make the whole thing transparent by talking to the girl). It may take some time, but you will know when to get out, the sonar will sound very different, and the background will scroll very slowly. But, as said before, just wait. It may take quite long.
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