The Command Module (Levels 5 through 7)

1. You can't open the safe until you've solved a bunch of other puzzles first.
2. Have you been to the Trading Post. [sic]
3. Read the sign and the instruction sheet?
4. Don't go on until you've been In Space, beyond the airlock.
5. Blow up the safe with the explosive. You'll need the drill, the explosive, the detonator, and the timer (from the PX dispenser). See the questions relating to those items.