Audio problem: Near the end of the film, when we see the Queen's new mutation, the scene opens up by showing all the scientists attached to the wall. Dr. Gediman is rambling on and on about the Queen's 'perfect' mutation. However, it is quite clear he isn't saying any of the words. In fact, from the way his mouth moves, it looks like he's literally saying 'blah blah blah, blah blah blah'. (01:27:05)
Audio problem: When Dr. Wren takes Cal's gun, he says, 'You really are way too trusting', but his mouth movements seem to show him saying something else. It appears to be something along the lines of 'far too trusting,' as opposed to 'way too trusting.' (01:09:30)
Audio problem: In the nest, the creepy guy talking does not sync his words with his lips half the time.
Answer: This is just speculation (and I haven't watched the movie for ages) but the operation is done with medical equipment in a facility designed for studying Aliens, which the military knows a little about. Maybe it is made of futuristic acid proof material.
If the surgical tools were acid proof, surely the floors of the cells that contain the grown alien specimens would also be acid proof. But that is how they escape: by sacrificing one of their own in order to spill acid blood onto the floor.
Well, you can imagine any acid-proof metal is probably very expensive. They can't make the entire station out of that stuff. Surgical equipment is probably necessary for their research, so they make an exception.
lionhead