The Netwalkers live above-ground, not in the darkness of the tunnels, but we make trips down into the Catacombs to bargain with its inhabitants for supplies and other necessities in underground bazaars set up in the abandoned stations. In return, we trade our skills with hardware and software and the knowledge we have acquired. I accompany Papa Lo and others on trips into the Catacombs and learn quickly about how to bargain, talk, and trade with the tunnel-folk.