Go up the stairs to the left and proceed the down the catwalk. When you reach the intersection Turn right and go through the door. Listen to the man and stand on the pad, don’t pay attention when he tells you not to move around, it doesn’t really make it go longer ;)

Now keep going straight through the next 2 doors. You should receive your PDA and get a quick tutorial on how to use it. Now turn right and you should see some stairs. Go up to the stairs and into the corridor. Keep going along the corridor.

You’ll see a nice little cut scene. Now go into the corridor to the far right. At the third corner in the corridor there will be a door leading to the bathroom, there are no useful items there. Opposite to the bathroom door is another door. Go towards the door but don’t go through it, instead turn right and go into the common room.

On the bench there will be a PDA. In the audio file he says that the keycode for cabinet 001 is 396. In the upper left corner of the common room is an arcade game, Super Turbo Turkey Puncher 3! You don’t get anything from playing it but you can see some sprites and textures in it from the original DooM. Also on the coffee table next to the game are 2 magazines which have the DooM 1 face sprite and the Quake 3 player model, Hunter on them. There is also a T.V next to the snack and drink machines which mentions the 149th annual QuakeCon winner won 10 million credits.

Now exit the common room and take the first door on the right. You can listen to the conversation the 2 repair guys are having about the strange things that are going on. Go forward a bit and you will be at a T intersection. Turn right and go towards Marine Command. You will see a corridor, keep going down it. Turn right at the intersection.

You will see a small work area where a scientist is working on a console and an IT guy is reconfiguring the sentry drone. Take the first door to the left labeled ‘Combat Prep’. Inside there is a video disk on the Plasma Gun on the counter. Now go back out of the room and you will see a door across from you, go through it and turn left. When you get to the door at the end of the corridor you will have completed your objective.

Go through the door and you will see a cut scene explaining your next objective. You have to go find a lost scientist. A sentry drone will be deployed. Now all you have to do is follow it.

While following it you will come across a lobby where to your right there are a table is with a video disk welcoming you to Mars Research Facility 1. Now follow the sentry bot again. Once the bot has stopped go down the stairs and in the upper right hand cornet there is a cabinet 001, the keycode is 396. Inside the cabinet are 2 pistol clips. Now turn around, forward a few meters and to your right there will be an elevator. Call the elevator. Now go down into the Mars Underground.