Also crucially, the munitions compartment is weaker on the outside of the tank than on the wall between it and the crew, so if it goes, it blows out of the tank

Also crucially, the munitions compartment is weaker on the outside of the tank than on the wall between it and the crew, so if it goes, it blows out of the tank (search term “blowout panels”) Fireworks and ammunition factories and storage facilities tend to have strong walls and relatively weak roofs for the same reason: if a building goes boom, you don’t want it to make neighboring buildings go boom, too.