GTA SA: Black Project Carl arrives at the airfield and is welcomed by The Truth, exercising on the top of an aircraft wreck. The Truth then berates Carl for having willfully worked for a government agent. He then tells Carl about a secret military research area, where he believes a "black project" is being developed. The Truth drops Carl off at the boundaries of the base before leaving. Carl must sneak into the underground area, by using the control tower to open the blast doors and get inside.