I tried going through the leak with my gas mask on, no luck, I mutated. Guessing I *need* to infiltrate their base & fight my way out the other way?
Well, I tried that in a variety of ways. Stealthing past them, attacking them immediately, luring them into the starting room in as small of numbers as possible, waiting a while for the gas to spread...one time I even waited too long for the gas to spread & I got mutated.
Is there anything I'm missing that will make it easier? I've already died/mutated 5 or 6 times.