Factual error: The machine guns supposedly have a "1,000 round capacity", but the size of the clips used in the guns are obviously nowhere big enough to hold 1,000 rounds.
Deep Rising (1998)
1 factual error - chronological order
Directed by: Stephen Sommers
Starring: Famke Janssen, Treat Williams, Anthony Heald, Kevin J. O'Connor
Continuity mistake: When the owner of the ship is screaming, "This equipment is state of the art. Top of the line," he goes from facing the Captain behind him to facing forward, between cuts.
Trillian St. James: What the hell are these things?
Finnegan: Real unfriendly.
Trivia: Footage of the party scene from the ship has since been re-used as stock footage in a number of low-budget films. Director Stephen Sommers has stated that he's not sure exactly how that works legally, but that he suspects the footage was licensed out by the studio in order to help recoup the budget, as "Deep Rising" didn't do well on initial release.
Question: Finnegan put only one torpedo through the hole in the side of his boat. Would only one be enough to destroy the whole cruise ship?
Answer: According to some good old Google Fu, a single torpedo hit could absolutely destroy and sink a cruise ship since they're not as fortified as a warship would be. They're meant to carry passengers, not go to war. Granted, it probably wouldn't be quite as dramatic an explosion, but you could also argue that any other explosives on Finnegan's ship, plus the cruise ship's fuel, could have been ignited in the blast. You also have to factor in that the ship was already heavily damaged from the monsters attacking and was in a more fragile state than it would otherwise be.
Suggested correction: The bullets being fired are .223 rounds, easily allowing for a 1000 round magazine.
Nope. Physically impossible.