Black Mesa is a dangerous place...

Imagine being stuck, deep down somewhere under the New Mexico desert, waking up after a nuclear bomb on the surface...
This mod allows you to play through a scenario like that!
You are a man, transporting radioactive materials into a research facility called "Black Mesa" and suddenly something goes horribly wrong, and you black out.
Later on, you wake up, and find everything destroyed. You have no Idea of what's going on, except that it's consequences from something you don't know what is. These are Unknown Consequences...