Cryogenic Tubes were the things that kept people (like Fry) safely frozen until the time the person inside is to be released. It automaticly starts with 1,000 years, but it seems that can be set ahead or behind by use of the dial. Without one, Fry would not be in the year 3000. They use Cryogenics to work. There are a lot of these tubes in Applied Cryogenics.