I could be mistaken, but I believe that the 2cm flak gun is not available for prestige until you reach level 9. I would recommend grabbing the Auxiliary U-Boat from the shop (they're free) and use that. Don't bother reloading the torpedoes or fuel, just discharge it when you're out of ammo and get a new one.
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The only sound that still scares me to this day...
The silence when the pinging stops. 
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