Synopsis by Hans J. Wollstein
In chapter five of S.O.S. Coast Guard, a trapped Terry (Ralph Byrd) escapes death in the nick of time by propping up the descending elevator with a block of wood. At the coast guard headquarters, Terry learns that the Adamic, a ship bound from Honolulu, may carry an ingredient vital to the development of Boroff's (Bela Lugosi) disintegration gas. He boards the Adamic in Hawaii and is allowed to search the vessel. But the ship's second-in-command, Belden (Herbert Weber), is secretly in the employ of Boroff and soon a gang of henchmen has taken over the vessel. Terry manages to extricate himself just in time to save the Adamic from colliding with a lighthouse. But can he prevent the boilers from exploding?