Why, do you probably think, a submarine for Cruel Seas? the rules don’t include real submarine warfare as written. And Yes you are right but the “Boot” is so iconic for WWII naval warfare that i had to do one. I use rules proposed by David Manley in his rules for coastal warfare ( Action Stations). They can be incorporated or combined with Cruel Seas.
So there are quite a lot of U Boat models in 1/350 ,like the one below made by Revell, but they are not waterline and basically to small for my taste.
You can see clearly how much longer and wider the model is in comparison .
More pictures and info on
https://wargamesgazette.com/2019/07/18/u-boat-typ-vii-c-for-cruel-seas-in-1-300/