5 knts itīs not a cheat, it was the real XXI performance  , for this was so lethal and advanced.
http://uboat.net/technical/electroboats3.htm
At 2 knts lost lost advantage and is like a VII boat. 
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But this ship can't sink!...
She is made of iron, sir. I assure you, she can. and she will. It is a mathematical certainty.
Strength and honor
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