Type XXI could drive deep but it still doesnt sort out the warm and cold water and whales lol. type VII would be crushed over about 179FT but type XXI could just take it i never said it wouldn't be damaged I.E glass and joints. but in the type IXC - C2 they changed the pressure hull from steel to armour plate increase the displacement to about 1000.
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Bring forth the Deliver
U997, Little rusty but she'll do.
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