An Urenbeck Catapult is a launcher that allows for practical travel within the solar system. It uses Metatron in its power train and works by compressing space and allowing the compressed space to return to its former state. Once the compressed space returns to its former state, the reactive force and buildup of potential energy enable the propelled object to travel "at sub-light speeds", according to Lloyd. The same principle is at work in the Zero Shift function.