Haven't seen you in a while. I was just talking about you with my friend, talking about clever youth...
He told me a story about some amateur soldiers who went raiding into the old tunnels. One got spooked by a noise and started shooting everywhere, another one threw a bad grenade and killed everyone in their group. Turns out my comrade didn't even need a tripwire in the end.
Disappointing, he said.
If you don't want to find yourself in a similar situation, take a shotgun and go to those tunnels at the chemical plant. If you can handle the enemy in such conditions, then cramped space will become your ally.