F.P.1 Doesn't Answer

In this classic 1932 German science fiction film, a huge airplane landing dock in the Atlantic Ocean is targeted by a saboteur who tries to sink the technical wonder. The story follows Lieutenant Droste and his pilot friend Ellissen as they fight to rescue their crewmates after a storm destroys the radio connection and the platform's defenses are breached. With the help of the owner's sister Claire, who has fallen in love with Ellissen, they must navigate treacherous waters and outsmart the saboteur to save F.P.1 from sinking.