What is the access code for the Illuminati safe in the Canyon of Titan (marked with an owl, contains the Eye of Providence)?
Sadly, it seems to be either bugged, or not intended to be solved. At least at the time of this writing.
If you use some tools and look at the source code, the acceptable code is empty. And since the system wont accept empty input, you will never get it to open unless you use force.
Safe requires to open high level of Safecracking (7, 8). Alternatively use dynamite.
It might be a weak pun on the whole Illuminati thing, to have a safe with a infinitely cryptic passkey.
Seems that future versions have this bug fixed, where the password is Rabboni.