When u go into miami go to terrorists (it's easier this way) and go into the first hostage room (not the vault) the have 1 person crouch ontop of the middle of the desk. Next get on top of him and jump up and down while hitting the crouch button Note:(have the person under you do the same thing) then u will enter a secret vent above the hosatge room. note(u can shoot them when the walk in the door but beware hey can shoot back).