The soliloquy which closes the film is not found in the book but was added to the script by the film's director, Jack Arnold.

"As a kid, I remember loving Jack Arnold's original version of this film", he explained.

With These Hands is a 1950 documentary film directed by Jack Arnold.

The Space Children is a 1958 film directed by Jack Arnold.

The Lively Set is a 1964 film directed by Jack Arnold.

"Jack Arnold wants to see how you seal these tunnels," Knowles went on.

Red Sundown is a 1956 film directed by Jack Arnold.

Outside the Law is a 1956 American crime drama film directed by Jack Arnold.

Girls in the Night is a 1953 film directed by Jack Arnold.