At the depth the characters are, experts suggest there would be less than 15 minutes of air for them.

The film was retitled to "In the Deep" in Spring 2016 and given a VOD/DVD release date of August 2nd through Anchor Bay Entertainment and the Weinstein Co. However, one week before the planned release, the film was bought by Byron Allen's Entertainment Studios, retitled back to "47 Meters Down" and given a wide-release theatrical plan for summer 2017 through Freestyle Releasing.

To replicate the organisms found underwater, finely chopped broccoli was added to the tank. Mandy Moore said it was quite unpleasant after a few weeks. She even compared it to filming inside a soup.

Mandy Moore and Claire Holt learned how to scuba dive for this movie.

James Van Der Beek was cast as Lisa's boyfriend Stuart, and filmed several scenes with Mandy Moore. However, all of those scenes were cut. The final version of the film only references Stuart.

Some copies of the movie were accidentally released under the original title of 'In the Deep' in August 2016, right at the same time the film was bought by a new company and scheduled for theatrical distribution in summer 2017. Some stores were not notified in time, and the DVD ended up for sale for about a day before being recalled. They are now considered collectors items and go for $50 or more. No blu was released in that title, only the DVD (although the bluray is now available in the theatrical name of 47 meters down)

47 meters is 154.2 feet.

The shark cage and crane were built on a farm in Kent.

Claire Holt (Kate) and Yani Gellman (Louis) have both appeared in Pretty Little Liars (2010). Holt played Samara and Gellman played Garrett.

Both Claire Holt(Kate) and Chris J. Johnson(Javier) starred in The Vampire Diaries. Claire as Rebekah Mikaelson and Chris as Logan Fell.

Both Claire Holt (Kate) and Mandy Moore (Lisa) have starred in shows with the character name Rebecca/Rebekah. Holt as Rebekah in The Originals and Moore as Rebecca in This Is Us.