(Marvel Mystery Comics v1 022, 1941)
During the Human Torch and Toro’s time foiling the Nazi invasion of clear-stand-in-for-Yugoslavia Aslavia they encounter and sink this submersible fortress:
But FAR more importantly they encounter what may be the best ridiculous Nazi superweapon I have ever seen:
The German Invasion Wall! The superweapon so ridiculous that even in a comic book it has to have bits of wood propping it up so that it doesn’t fall over when firing its cannons! I love it.