CAV (Commonwealth Ark Vessel) Tranquility was the first Ark Ship to land on the planet Mars, in 2072 to begin terraforming of the planet, which was completed by 2085. The ship 'Tranquility' landed in the area that is now known as Tranquility Valley, and many settlers from this ship settled the first city on Mars, Ninjing (meaning Tranquility in Chinese). The ship now stands in the Tranquility Valley National Park, as a museum to the terraforming and settlement of the planet, aswell as Land-That-Was.