They didn't in real life and they shouldn't here. All large ships had torpedo protection and deck armor.
- 5
This is only true if your magnetic detonator in your torpedos actually work and enables the 'keel shot', which was a huge problem for the US Navy well into the war. I don't know about other navies, though. But I suspect the vast majority of torpedo detonations in WW2 were executed with contact detonators, and in those cases 'torpedo armor' was very relevant indeed.Torpedos detonate under the keel, if done right. This removes water and either raises the ship or removes the updraft at that point resulting that the ship will fold itself there under its own tonnage (the more tonnage the worse the effect) putting a HUGE strain on the structure up to rupturing ship/ship breaking into pieces. And AFAIK there was not much armor under the keel but forming a 'belt' around the ship to deflect projectiles and to some extend deck armor. So while I would say, a part of the armor should work versus bombs, this would not be true versus torpedos.