YouTuber Markiplier has entered production for his upcoming horror film Iron Lung, which is based on his own screenplay. Deadline was first to report.

The film is being shot in Austin, Texas, and Markiplier is self-financing the project. Based on the 2022 submarine horror game of the same name by David Szymanski, plot details remain tightly under wraps. Markiplier is directing and also serving as a producer on the project, along with Will Hyde and Jeff Guerrero. Caroline Rose Kaplan (The Plot Against America) will star opposite Markiplier.

Iron Lung takes place in a distant future, after the Quiet Rapture causes all habitable planets and stars in the universe to vanish, leaving only space stations and starships as remnants of known life. An expedition is sent to AT-5, a desolate moon with a blood ocean, to search for natural resources. The player, in a small submarine called "Iron Lung," confirms resource readings while encountering strange objects and facing challenges like decreasing oxygen, pressure damage, and fires.