Chapter 35-3 The End is Near

[Cabbage Patch]

So there is no way to seal the hatches effectively?

The hatches on the Bradley lock from the inside, and can't be forced open from the outside without explosives or a cutting torch. It is a common practice for the crew in the turret to fight with the hatches open, or partly open, to have a better view of the battlespace, which might make them vulnerable.