F. P. 1 Doesn't Answer (1933)

"F.P.1 Doesn't Answer" is a 1933 adventure / science fiction movie starring Conrad Veldt, Jill Esmond, Leslie Fenton, that tells the tale of when a gigantic floating platform is built in the mid-Atlantic to use as an oceanic airport. However, its destruction seems imminent at the hands of foreign saboteurs.