I'm trying this mission on normal and I'm no good at strategies so all I did in every mission was build as many vehicles as I can and upgrade them to the max then send them out. It doesn't seem to work here as I'm overwhelmed with enemies. So I'm just asking if anyone's got any good strategies on passing this mission. And how do I even complete it, I activated those airlocks (I'm not sure if that's what they're called, I have a rubbish memory) and I don't know what to do next.