in cuba when you come out your safehouse walk up to the little wall jump over it 
and you will fall under ground and die BUT once you die you will spawn back under 
there and you will not die you can walk about under ground shooting the top floor 
and people will run and no one can get you but you cant get them or get out BUT i 
think if you kill your self you will spawn out if not you will have to go save game 
then quit and then load game. sometimes it doesent work. hope you liked this.