In Once Human, you may come across a certain safe in the city of High Banks requiring a passcode to open. As with literally anything with a lock, it is worth your while to open, so if you're looking for the passcode, you've come to the right place.
How to open the High Banks safe in Once Human (Map)
The passcode for the High Banks safe is "325" and it is obtained via a random side quest (Boy Just Wanna Have Fun) you can start if you find it while wandering the city. You do not need to complete this side quest to obtain the rewards from the safe, so there's not much value in looking for it if you're already reading this. However, this side quest does eventually lead you directly to the safe in High Banks, so it has that going for it.
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If you didn't find the side quest and are looking for the safe, you will find it at the road intersection in Western High Banks, in a ramshackle storefront that looks similar to all the others in the area.
The safe is attached to a cash register in the store, shown as interactable via a purple light, so you're in the right place if you see that. Walking up to and interacting with the safe will allow you to input the passcode. Upon doing so, you'll be rewarded with a random assortment of high-quality materials that you can use back on your base.
There may be additional safes within High Banks that you can unlock with this code (or a different one), so keep your eyes peeled for conspicuous glowing lights in the area. You never know what you may find. If we find out anything else on this matter, we'll let you know right here.
For more quality guides relating to Once Human, check out Can you change worlds in Once Human? right here on Pro Game Guides.