Stardrive

Atlantis being a space ship in itself has a functioning stardrive.The stardrive lets atlantis travel to diffent planets or evan galaxyes.The stardrive needs alot of power so it can only be activated if there are three zpm's powering the city but Dr.mckay and col.shepard have powered the stardrive using only one zpm and the drilling platform for a litle more power to get it in the air.Atlantis doesent have a hull like other space ships instead it has a shield that contains the atmosphere.