Looking for a wad where you go in a dam?

I remember seeing a Youtube video a while ago of a custom map/wad playthrough.

The first level had you start on a highway and end up in a hydro plant/factory. It also had dual wielded pistols (though I'm not sure if this was separate)

sounds like Deus Vult II

kmxexii said:

sounds like Deus Vult II

Thanks, this is it, I found it by myself on a top 10 wad video.

NeoDoom also had a dam map.