In Prey, the Security Room in the Talos 1 Lobby has a safe in it behind the main desk. If you chose to drop down from the ceiling rather than enter through the front door, you might miss this safe, because it will be behind you when you drop down.
The code for this safe is 0526. You find it by viewing a book in this room that references the bible passage Judges 5:26.
Prey (2017) Security Safe Code - GameRevolutionWATCH GALLERY