The tunnel appears to have no exit. A cylinder of unlimited bricks and piping seemingly stretching on for miles, enveloped in a dark fog that makes it impossible to see farther than a few feet in front of you. And based off of what you hear, at an indeterminable distance, you are not alone. This game is easier with multiple players but you will have to allocate supplies carefully. Your torch has a limited lifespan, so be sure to turn it off before putting it away. You can just about make out the number of the corroded piping stabiliser you are by, a way to determine how far you've walked.