Paul Walker's Chesapeake Bay Retriever Boone played his character's dog in the film.
Jessica Alba was unhappy with the film, mostly because her character was rewritten during filming. Also scenes were shot with her stunt double in a bikini behind her back, forcing her to spend the majority of the movie without much clothes on.
Due to US moral views, Sony Pictures digitally altered the theatrical trailer to give Jessica Alba a 'less revealing' bikini. See also Pathology (2008) and The Hangover (2009).
According to the GPS, the location of the wreck is at Latitude 24° 58' 250'' North and Longitude 77° 18' 596'', which is an island near the Bahamas.
Jessica Alba was trained by a scuba diving expert located in Oklahoma City at the time.
Most of the diving related scenes in the movie were filmed with help from Stuart Cove's Dive Bahamas, which is one of the world most renowned diving companies. The company helped charter boats for the crew as well as drive the actors around to various locations off the island. Most of the underwater photography and shark scenes were filmed with the Stuart Cove's staff as well, because they have been working with those sharks around the island since the 1980's.
According to director John Stockwell on the DVD commentary, a lot of the violent scenes were edited or digitally altered to secure the desired PG-13 rating.
This is the first film produced and released by Metro-Goldwyn-Mayer under the Sony banner.
Second time Paul Walker and Scott Caan have worked together. Varsity Blues is the first.
This marks the second time that Jessica Alba and Ashley Scott have worked together, the first time being the Fox sci-fi series "Dark Angel".
Appears to be effectively a modernised remake of the 1977 movie "The Deep" with Robert Shaw, Jacqueline Bisset and Nick Nolte.
In the same year, Jessica Alba appeared with Devon Aoki in Sin City. Aoki previously appeared with Paul Walker in 2 Fast 2 Furious.