New response to questions
Man, they can churn these out, just like Nora Roberts! I love a good fantasy, you don't have to obsess over butchered physics (Is that only me?).
As usual, they are leaving out the huge environmental effects of grout and pumping. They still live in the fantasy that they won't need it, although they leave all their options open by never mentioning it. I can't wait until they get to that point and say: "Ha! You never asked that question!".