After kilometers in the dark tunnel which had now turned into a large water pipe, the landscape opened up to the Surface. Tom stumbled over the lip on to the dusty dirt. The night sky hung over them.

Tom offered his hand out to Ellie to help her over the edge. She grabbed it and teetered over. Her footing was looking less sure than when they started, no doubt the burns had something to do with that. Her hand was sweaty in his, but he managed to keep her on her feet.

A ...