 The original script called for Rev. Scott to send Mrs. Rosen on her  underwater mission, and for her to be trapped and need rescuing by  him. Gene Hackman (qv) decided that his character would never ask  her to do this, and suggested their characters situations be  reversed. Director Ronald Neame (qv) agreed, and they persuaded  Shelley Winters (qv) that this was indeed better for her  character.