Always save when surfaced.
Always save when in control room, F2, view.
Always save at least 50km off shore.
Always give the game a little time at TCx1 after being on high TC before you save.
Never save with any known contacts, go some 30km away from your last sinking.
If the first save works, do not over write it. Make a new one which you may over write.
Give the game a little time before you exit, just a couple of seconds of your time...
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