Kinda stuck.. need some help.. (SPOILERS!)

[Thaliur]

You kind of missed something, yes, but not exactly in this room

Spoiler below!

In the locker room, I think it's in the "shaft 12" area, you will find a seemingly empty piece of paper in one of the lockers, and a text that said something about having to walk to the "crazy biologist room" or something similar just to find out the entry code for the storage area.
If you use the empty sheet of paper in the bio room while the UV light is on, you will get the code.