"But about six years before the Fenris Company went to pieces, they decided to concentrate in one city, here in the archipelago. The sea water stays cooler in the daytime and doesn't lose heat so rapidly in the nighttime. So they built Port Sandor, here on Oakleaf Island." "And for convenience in monster-hunting?" I shook my head. "No. The Jarvis's sea-monster wasn't discovered until after the city was built, and it was years after the company had gone bankrupt before anybody found out about what tallow-wax was good for." I started telling him about the native life-forms of Fenris. Because of the surface temperature extremes, the marine life is the most highly developed. The land animals are active during the periods after sunset and after sunrise; when it begins getting colder or hotter, they burrow, or crawl into caves and crevices among the rocks, and go into suspended animation. I found that he'd read up on that, and not too much of his information was incorrect. He seemed to think, though, that Port Sandor had also been mined out below the surface. I set him right on that. "You saw what it looked like when you were coming down," I said. "Just a flat plateau, with a few shaft-head domes here and there, and the landing pit of the spaceport. Well, originally it was a valley, between two low hills. The city was built in the valley, level by level, and then the tops of the hills were dug off and bulldozed down on top of it. We have a lot of film at the public library of the construction of the city, step by step. As far as I know, there are no copies anywhere off-planet." He should have gotten excited about that, and wanted to see them. Instead, he was watching the cargo come off--food-stuffs, now--and wanted to know if we had to import everything we needed. "Oh, no. We're going in on the Bottom Level, which is mainly storage, but we have hydroponic farms for our vegetables and carniculture plants for meat on the Second and Third Levels. That's counting down from the Main City Level. We make our own lumber, out of reeds harvested in the swamps after sunrise and converted to pulpwood, and we get some good hardwood from the native trees which only grow in four periods of two hundred hours a year. We only use that for furniture, gunstocks, that sort of thing. And there are a couple of mining camps and smelters on the mainland; they employ about a thousand of our people. But every millisol that's spent on this planet is gotten from the sale of tallow-wax, at second or third hand if not directly."