Sorry for the almost 2 year late reply but for some reason steam didn't alert me this thread was created on my item. To be frank; The Door Lock code is hidden inside the habitat you start in - it's on the Datastick on the floor which you can download into your Datapad to view. I forget the exact code but I remember that's how i made the mission in order to ensure that players would get the stick before going for the door.

Edit: Also How are ou freezing on Earth. The Final Test Has no HABITAT (to date the only one with a code is the second mission) so either your getting at two different issues or something is seriously wrong with the game.

Thanks for the reply mate. I honestly don't remember where I found the answer in game, but I did find it. I'll have to jump back in game now to see. Thanks for the reply though!