@GeneralHandGrenade Thanks, I was actually hoping you would reply here as you have a lot more insight into why these rules are the way they are now.
I like that it is intended as a bonus, but it reads like a massive penalty. If it’s the Maritime Air Patrol that prevents Submarines from declining combat outright, I don’t see what stops you from throwing something heavier, even a Light Cruiser at the Submarine. and forcing it to endure a better dice roll before submerging. Again, because the Maritime Air Patrol already prevented it from declining combat.
How I’m interpreting the rule also makes historical sense, as WW2 submarines were really more just submersibles, operating on the surface most of the time.