A list of all passwords needed to progress through the main story.
All Passwords List
6786 – Used to enter the elevator at the end of Sonoma Bunker Level 1. The password can be found on a desk in the right room on the other side of the reactor. A cutscene will play when entering the room, revealing the number.
4724 – Used to enter the elevator at the end of Sonoma Bunker Level 2. The password can be found on a desk in the second room on the left after going up the stairs.
8978 – Used to unlock the door to the maintenance area in Sonoma Bunker Level 3. The password can be found on the desk in the control room before entering Level 3, and thus can be a little problematic.
2264 – Used to unlock the door to the Mantis Ship Bridge on the very last level. The password can be found on a PDA just before the door.
Thanks to Hyper for his great guide, all credit to his effort. you can also read the original guide from Steam Community. enjoy the game.