I really enjoyed this book. Take it along on your next trip. It is small, easily portable and a great yarn. The concept and story is great to share with your significant other. My husband was actually looking forward to my nightly update of what happened to the survivors down below. "It doesn't look good, they are running out of air." "Oooh, you won't believe how they solved the air problem!" Classic create a problem and solve it science fiction. This is not a Sector General novel, but try those too. They are a great romp!