Isaac Asimov was approached to write the novel from the script. He perused the script, and declared the script to be full of plot holes. Receiving permission to write the book the way he wanted, delays in filming and the speed at which he wrote saw the book appear before the film. The scenes of crewmembers swimming outside the sub were shot on dry soundstages with the actors suspended from wires. There was some additional hazard involved because, to avoid reflections from the metal, the wir ...[Read Story ]