The film was shot entirely with an iPhone 7 Plus camera.
The movie was shot in just 10 days.
The budget was only $1.2 million according to 'The Times', UK.
Steven Soderbergh's first horror/thriller movie.
Hospital scenes were filmed in Pomona, NY at the Summit Park Hospital that recently closed
The film was shot entirely on the iPhone 7 Plus in 4K using the app FiLMiC Pro.
During the scene where Nate leads a group discussion in the common room, Steven Soderbergh's film Full Frontal (2002) is playing on a TV in the background.
The film had its world premiere at the Berlin International Film Festival on February 21, 2018.
Matt Damon: Sawyer's lawyer