You have to recharge your high-pressure air in the ship control station! I used to have this problem all the time when I first started playing Sub Command. Once it gets to below 50% (somewhere around there), you can no longer fire weapons. If you're submerged, you can get another 10 points of high-pressure air from electrolysis. After that, you have to snorkel to refill your high-pressure air banks.
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