Below is a 2002 submarine supernatural horror film directed by David Twohy, written by Darren Aronofsky, Lucas Sussman and Twohy, and stars Bruce Greenwood, Olivia Williams, Matthew Davis, Holt McCallany, Scott Foley, Zach Galifianakis, Jason Flemyng and Dexter Fletcher. The film tells the story of a United States Navy submarine that experiences a series of supernatural events while on patrol in the Atlantic Ocean in 1943.

Initially intended as a historical sci-fi thriller, Twohy retooled the script into a horror following his success with Pitch Black. Below was shot on location in Lake Michigan for exteriors (using the World War II-era U.S. Navy submarine USS Silversides) and at Pinewood Studios.

Twohy refused to re-edit to get a PG-13 rating, so Dimension gave the film a limited theatrical release on October 11 2002 with little advertising, resulting in earning only $605,562 in North America box office. It received mixed reviews.