When in the Data vault go to the Data Vault Symbol, and hold Left Trigger(L2), Right Trigger(R2), Left Bumper(L1), Right Bumper(R1), Square, and Triangle. This will open a Secret code menu, there are many codes below. These will only be able to be used once.

Code	Effect
DREAMLAND	Unlocks nightmare mode.
MANIFEST	Gives the player 80 fabrication kits.