 Two endings were shot: In one, both commanders die; in the other, a  third vessel rescues them. The final ending was determined by  preview results. The USS Haynes was portrayed by the USS Whitehurst,  captained by Walter R. Smith (I) (qv), who received a "technical  advisor" credit and can be seen portraying the ships chief  engineer. Eva Novak (qv) can be seen in a photo as the wife of Von  Stolberg.