Sure thing. First, keep a reliable light on. A headlamp with extra batteries or a backup torch is a must. You’ll need a map or a GPS tracker—if it’s all concrete, a compass keeps you oriented. Pack a small kit: a multi‑tool, duct tape, a whistle, a knife, a fire starter, and a small first‑aid pack. Keep your gear tight; nothing should swing around or get stuck in tight corners. If you’re down in a tunnel, stay low and breathe slow; a sudden draft can knock you over. Keep noise minimal—talk in short bursts, avoid shouts that echo and might attract unwanted attention. And remember, if something feels off, move out. Don't get trapped in a space you can't see a way out. Stay calm, stay disciplined, and get out alive.