DeepStar Six

Laidlaw

Joyce Collins

McBride

Snyder

Scarpelli

Richardson

Diane Norris

Van Gelder

Hodges

Osborne

(uncredited)

Robert Harmon was originally set to direct.

Writer Lewis Abernathy sold his script at the same time that friend James Cameron was working on his own "underwater monster saga". Despite Cameron's asking that he delay this movie to avoid competing with The Abyss (1989), Abernathy went ahead and was thereby deemed persona non grata with Cameron and associates until they patched together their friendship when Abernathy accompanied Cameron on the September 1995 filming of the wreck of the Titanic for Titanic (1997) (but not any actual dives to the wreck itself).

Richardson performs electric arc welding outside of the station, at the bottom of the ocean, several thousand meters deep. At present, underwater welding is not technically possible deeper than approx. 1000 meters (3300 feet) underwater.

When Snyder is accessing the computer system for the procedure to secure the missiles, the computer asks him to define "abandoned." The first choice offered reads, "Abandoned for repair or or removal," with the word "or" duplicated.

Just after the malfunctioning hatch falls on Laidlaw, McBride rushes over to help him. When he touches the hatch, it flexes indicating it's made of rubber.

James 'Jim' Richardson: [Going over a checklist] Umbilicals?

James 'Jim' Richardson: Well, at least Snyder will get his name in the Guinness book of records. I mean, causing two nuclear explosions in one afternoon has to be some sort of record.

McBride: The US Navy. It's not just a job, it's an adventure!