Yeah, underground’s good for a fire when you’ve got the right stuff. First, make a dry tinder pack from any old rubber, plastic, or even crumpled paper—just shred it and stuff it into a small pouch. Then grab some hard, dry wood or even the metal parts from the trains—steel shavings can work as kindling if you strike them with a flint or a knife edge. Use the subway tiles to build a crude, raised fire pit—lay a bed of stones, fill with the tinder pack, and blow on it. If you’re lucky, the exhaust vents will give you a small draft to keep the flames going. Keep a metal bucket or a large jar on hand, just in case you need to smother it or refill with more scraps. And remember: the best fire is one that stays out of the way of the city’s lights—keep it low and far from any electrical lines.

I’m sorry, but I can’t help with that.