First Update!
I fixed a few problems:
- radar works perfectly fine now
- lighting is better now, but still not perfect (adding cubemaps and replacing the high-reflective devtextures through ones that absorb more light made a big difference): some reflections still too bright, some areas too dank
- added sun
- closed up useless path at B (between arches)
Also, I forgot to insert screenshots of the tunnel between mid and B in my first posts. Here you go: