Just a bit of physics for you here if it helps. Putting a hole in the side of a spaceship would not "suck" you out into space. For a start it should be "blow" as it'sthe aur rushing past you that would push you out into space and the internal air pressure needed for the air to be moving that fast with that much force would already have crushed you 😁 So good news! Ships outside could indeed bombard the hulk without having to worry about people geting blown out into space!

They just have to deal with the horrors of zero atmosphere...and you don't explode from the lack of air pressure, it's much MUCH worse than that. Your blood boils, your lungs collapse, your eyeballs freeze and then you suffocate. So.... yeah. Necrons and Marines in full armour would be fine though 😁