Trivia: The submarine used in the movie as a (supposed) nuclear submarine was the U.S.S. Ronquil (SS-396), a WWII Balao-class diesel-electric submarine that had received a GUPPY IIA conversion. The number painted on the sail (509) was selected because it was from a block of hull numbers canceled at the end of WWII and never used.
mdwalker
1st Mar 2017