The film was shot over the course of ten weeks from 22 March to May 1961, with six weeks being dedicated to the 3D portions of the film. The 3D scenes were shot in black and white, but were printed using colour film stock. The optical effects were completed by 20th Century Fox by August 1961.
The movie was shot over ten weeks, from March 22nd to May 1961, with six weeks specifically dedicated to the 3D sequences. These 3D scenes were filmed in black and white but printed using color film stock. The optical effects were finished by August 1961 by 20th Century Fox.