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.

Mandy Moore and Claire Holt learned how to scuba dive for this movie. Neither actress scuba dived before.

The majority of underwater filming took place at The Underwater Studio in Basildon, Essex UK.

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, and compared it to filming in soup.

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.

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

47 meters is 154.2 feet.

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

Claire Holt (Kate) had some swimming experience prior to this movie having starred in a previous Nickelodeon tv show about mermaids called H2O: Just Add Water.