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LieutenantDrostewantstobuildanairstationinthemiddleoftheoceantoallowpilotsonintercontinentalflightstorefuelandrepairanydamagetotheiraircraft.WiththehelpofthepilotEllissen,hemanagestowinthesupportoftheLennartz-Werkefortheproject.Ellissen,whohastakenupwiththeowner'ssisterClaireLennartz,shiesawayfrommarriageandseeksnewadventure.<br/> Aftertwoyears,theplatformhasbecomeacityontheocean,withrunways,hangars,hotels,andshoppingcenters.Duringastorm,theconnectiontotheplatformissevered.Thelastsoundstocomeoverthetelephoneweregunshotsandscreams.TheweatherclearsandthebestpilotsimmediatelyheadforF.P.1.Ellissen,inalovesickdepression,isconvincedbyClairetoaccompanyhertotheplatform.Theirplanecrashesontheislandbuttheysurvive.<br/> ThecrewofF.P.1hasbeenthevictimofasaboteur,whoknockedthemoutwithgas.BeforechiefengineerDamskyfledinaboat,heopenedthevalves,causingadangerthatF.P.1willsink.ClairefindsthebadlyinjuredDrosteandtakescareofhim.EllissenhastorecognizethatClaireisslippingawayfromhim.Afterashorttime,hepullshimselftogetherandtakesaplaneouttogethelp.Heseesaship,jumpsfromhisplane,istakenaboardtheship,andcallsforhelpviaradio.AfleetofshipsandplanesaresenttorescueF.P.1.
