Possible Unknown Chamber in Dogtown

The photomode in 2.2 on consoles enable the collission off/on option, so it's a very helpful tool to search through walls or hard textures for things we may have missed.

I did one such research last night. I went to the disabled metro station vis a vis the Batty's Hotel, and turned on photomode. I craned the camera down a bit, and was able to see what looks to be a chamber somewhere underground, near Farida's clinic where there is also the underground promenade with closed stores and all the likes.

I went to that area and took the last 2 pictures. The magenta lights on the right obviously showing ads not loaded, but then there is also the other magenta source of light from the top left which I wasn't able to locate, seems to be around the building where we can find a relic terminal.

Is any of this known pre-2.2 patch? Or does anyone know of this presumably looking chamber?