Reactor P-218F

Has anyone ever played this wad? If so, do you have any idea how to make a fog as intense as when the meltdown happens? I know how to make fog in ZDoom, but it's never as strong.

Hmm, that level name sounds familiar, can't remember to have it played though.
To make "thick", intense fog, just make the fog as you're used to and lower the light level in the sectors with the fog. The lower the light level is the more intense the fog will be.

Cool, thanks!

Has anyone ever played this wad?

Yes, I remember playing the wad (by Peter Runge). It starts out looking very ordinary but turns out fast-paced and intense. The nuclear meltdown effect in the end was cool.