Forgot about that crowbar/objective thing.
Going E to open the trapdoor takes too long, I believe. If we need to get through the MG in any case, why don’t we take it out on the way in and ignore the large room? Especially when we can’t return that way? The only advantage there is that we can turn off the alarm once.
My move could be: Sneak N (1), Sneak N (1), if not seen knife the machinegunner. If seen seen we are in trouble, I’d have two actions for 5-6 on a d6 to eliminate him.