His role as Adam Penner was the final role for Philip Tonge. He died on January 28 1959 before this film went into release on May 15 (shooting began December 11 1958).
I thought you weren't going to make it.
Maj. Bruce Jay: We almost did.
The plane crashes into side of mountain, but both the pilot's corpse and approaching footprints are on level ground.
In the film, John Carradine's character is named Dr. Karol Noymann. In the ending cast list, his character is listed as "Carl Noymann."