off course, meaning search and rescue efforts will be focused in the wrong area. As a search for the missing plane is launched, veteran aeronautics expert Joe Patroni joins the rescue operation as a technical adviser, joined by the jet's owner, Philip Stevens. Meanwhile, the trapped crew can only contact rescuers by getting a signal buoy to the surface. Captain Gallagher and a professional diver and passenger, Martin Wallace, enter the main cargo preparing to swim to the surface using air masks. The hatch suddenly blows open, killing Wallace. Gallagher barely makes it to the surface and activates the emergency beacon. The signal is detected and a rescue operation is launched. Meanwhile, the plane's fuselage is steadily leaking. The Navy dispatches a sub-recovery ship, the USS Cayuga, the destroyer USS Agerholm, and a flotilla of other vessels to the crash site, rescuing Gallagher. Guided by Gallagher, Navy divers rig the plane with balloons and inflate them, slowly raising the aircraft, which could split apart. Just before the plane reaches the surface, a balloon breaks loose and pressure is reduced to stabilize the aircraft. A cargo hold door inside the plane bursts open and seawater swamps the cabin; Chambers, pinned under a sofa, drowns. Emily’s injured friend Dorothy dies from her injuries, Wallace's widow, Karen and a stewardess drown. With time running out, air pressure is increased, raising the plane to the surface. All survivors are quickly evacuated. Captain Gallagher and Stevens's assistant, Eve, get trapped inside and escape through the upper deck. All buoyancy is lost and the 747 slips under the waves for the last time. The survivors are unloaded on a nearby rescue ship. Cast Jack Lemmon as Capt. Don Gallagher Lee Grant as Karen Wallace Brenda Vaccaro as Eve Clayton Joseph Cotten as Nicholas St. Downs III Olivia de Havilland as Emily Livingston James Stewart as Philip Stevens George Kennedy as Joseph "Joe" Patroni Darren McGavin as Stan Buchek Christopher Lee as Martin Wallace Robert Foxworth as Bob Chambers Robert Hooks as Eddie Monte Markham as Banker Kathleen Quinlan as Julie Gil Gerard as Frank Powers James Booth as Ralph Crawford Monica Lewis as Anne Maidie Norman as Dorothy Pamela Bellwood as Lisa Stevens Arlene Golonka as Mrs. Jane Stern Tom Sullivan as Steve M. Emmet Walsh as Dr. Williams Michael Pataki as Wilson George Furth as Gerald Lucas Richard Venture as Commander Guay Elizabeth Cheshire as