At the right of airlock in your habitable module, you can see an interesting label. It says: "If you hear a sound outside, AT ANY CIRCUMSTANCES, DO NOT OPEN THE AIRLOCK". This interesting detail has given me a food for for thought. I suppose the company, that send us here KNEW about someone/something will be hunting us here, so they did the warning label. I mean we are expendable at this point. Why would they send so many personnel down here?