This dream took place inside a building with many people (humans & later what seemed to possibly be various old versions of humans & modified humans & non-humans, some were possibly aliens, and some were possibly human-like entities), and this building felt deep like it was underground with probably different floors that I did not have access to like a hidden secure facility of some kind that we were trapped in (it felt like there was probably almost no way for us to escape).
At some point I found some wood chips covered in a chemical with a very strong smell that made it seem harder to breathe, like it sucked the oxygen from a room, and so some people scattered them in various trash cans outside the various buildings & rooms to try to avoid putting them in one location so that it would not suck out the oxygen & possibly kill people.
This dream took place in another country, at some point I saw my reflection in a window or wall or mirror & my glasses (eyeglasses) were very tinted & would not transition back to clear (everything else was normal), I have photochromic (transition) lenses, this confused me, and so I started doing a reality check eventually I assume.
During my reality check I closed my eyes & I opened them again to see if anything changed, I remember being surprised that I did not accidentally wake up, so at this point I knew that it was a dream, and so it became a lucid dream.
All that I can remember of this dream is that I was playing the video game Fallout 4, I remember comparing armor mods for my armor trying to figure out how to balance making my armor lighter with armor mods (like the ultra-light mod) while still having a good combination of other armor mods that provide various abilities (like dense which offers reduced damage from explosives), but that is all that I can remember of this dream.
Unfortunately I forgot almost all of this dream, I now only remember that the dream involved me at work at my IT Assistant job at The BP Library, my female coworker JB was one of several of my coworkers who was also working there, at some I did not see JB anymore & I was not sure if she had left to the M Branch for the day or if she was gone for the day or if she was taking her break, but that is all that I can remember of this dream now even though I know that there was more to this dream; I almost completely forgot this dream if it were not for JB standing out in this dream by her disappearance, that was the only reason that I remembered part of this dream at all.