Fair enough.
Just a side note though...
In real life, if your U-boat was raked with 20mm armor piercing gunfire for five minutes, it would be VERY likely that many of the crew would be killed or injured.
PT boats have more than one weapon that is a threat to U-boats.
(Heck, a .50 caliber armor piercing shell would do the job.)
Secondarily, you'd be unable to dive to any useful depth due to other damage. A U-boat hull is a pressure hull... not an 'armored' hull.
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