Fun but Silly
at the same time. It must have been a try at imitating American high flying silliness of the pre-war years. An almost proto-scifi serious/comedic splash down. We all know that when planes crash in the sea they are never wrecked and perhaps the funniest part, for me anyway, was seeing Olivier as an action hero. Also, its never mentioned the villians are German except with a nod to a freighter named the "Viking".
Let it be unsaid: insignificance is the locus of true increpation.