Three helicopters were involved in an extensive chase scene through the streets of San Francisco. Two picture Helicopters and a Camera Ship were flown in formation approximately 30 feet off the deck down the very narrow streets of the financial district. Certain areas only allowed for about 5 feet of blade clearance from the buildings. Extensive explosions, fire and smoke further complicated the night time scene by greatly reducing the pilot’s visibility. VFX were only used to add the muzzle flash to the practical guns that were installed on the aircraft.