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Behind the scenes photos from Houdini's movies are pretty rare, and this is the only one I've ever seen showing the outside of the submarine on what appears to be a movie studio backlot (probably the Famous Players-Lasky Studio in Hollywood). In fact, seeing how Houdini is dressed, I'm thinking this photo might have been taken at the same time as this other studio shot.
The dockside scenes of Harry Harper preparing his submarine for its trip to the South Seas are among those now lost on the missing reels of Terror Island.
Congratulations to the new owner of this unique Houdini image.