In this chapter, the Underground Man explains that he has been working on the tower for a long time, but that he still needs more time to reach the peak temperature of the tower. He tells Sora that he's been trying to get her to take it back, but she doesn't want to, because it's too expensive. He also tells her that there's a rumor going around that the tower is hidden underground in a waste dump in the city of Nagasaki. Sora wonders if this is true. The Underground Man points out that there are lots of new technologies that have been developed in the last few years, and that they're being used all over the world. He points to the heat release mechanism as an example of how they've been using these new technologies to keep the tower cool.