Abstract: Method and apparatus for conducting geophysical exploration from a marine vessel. A ship includes a pair of booms mounted on the stern thereof which are moveable between a stowed position adjacent the ship and an extended position athwartships. A plurality of winches are mounted on the ship. Each winch includes a cable wound thereon. Each cable is journaled over pulleys to a different airgun deployment station on the boom. Each airgun may be individually deployed in the water behind the boom under power of the winch associated therewith. Roller mechanisms mounted on the boom support a different firing line cable which is connected between equipment on the ship and each airgun.