The Potent Voyager is a sort of ship built in Krull, designed to go off the Edge. The crew should then be able to tell Great A'Tuin's sex, one of the greatest questions of the Discworld. It has been constructed by Goldeneyes Silverhand Dactylos. It was cast from solid bronze. It has portholes and an air lock. It was sent into the void by being pushed off the edge of the Disc, proving that there is such a thing as a free launch.