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DIRECTED BY: Mark Fischbach
FEATURING: Mark Fischbach
PLOT: In the far future, when humanity is dying off, a convict is sent to the bottom of an ocean of blood on a distant moon in search of… something or other.
COMMENTS: If you’ve heard the rags-to-riches DIY success story of the fan video game adaptation Iron Lung, which played in 4,160 theaters worldwide in early 2026 based purely on a grassroots campaign where fans of YouTuber-turned-feature-film-director markiplier (Mark Fischback) begged cinemas to show it on the big screen, and are wondering whether the non-initiate will enjoy this, my answer is a firm “no.” While the film is a phenomenal success story on its own terms, it was made for a narrow niche audience, and unless you’ve played the video game or count yourself among markiplier’s 38 million YouTube channel subscribers, you ain’t it.
At least 90% of Iron Lung takes place inside a cramped submarine the size of a living room, crowded with metal apparatus and sensors. Convict pilot Simon (Fischback) is alone for almost the entire film, with occasional conversations over intercoms with bad connections to break his solitude. The craft is rickety, has no portals to see the outside world (which would just be a wall of opaque red anyway), has frequent blood leaks, and lunches a lot. You get to know every sharp corner and blinking light in the sub in the film’s 2-hour runtime; you almost feel like you could pilot this tub yourself. The detailed set conveys the feeling of a metal prison, and the sound design is superlative: drips, scrapes, static, echoes, thumps, all sorts of dreadful alarming noises to remind you that you are in a tin can surrounded by certain death. Based on the editing in the climax, I think that Fischback could direct a thrilling action scene—assuming you knew who, what, and where the antagonist was and what the hell was going on.
But as impressive as the film’s technicals may be, the script is simultaneously boring and confusing. I mentioned that the film was 2 hours long, and it makes sure you feel every minute. Reports suggest the game itself can be finished in under and hour—an hour and a half if you dwaddle—so there is a lot of padding added here to convey the combination of tedium and dread the protagonist would experience. Watching the movie, you get the sense that the game is nothing but a long test of your ability to press buttons, flip switches, and turn knobs, because this mostly what Fischback does on screen. There is a part where he accidentally irradiates some of his handlers, which has no payoff. There is a tormented personal backstory delivered in monologue, meant to humanize the an anonymous explorer. But mainly, it’s Fischback flipping switches, turning knobs, and bemoaning his fate.
The mystery of this abandoned moon is where the film’s claim to weirdness comes from. The premise itself is absurd: supposedly all the stars and planets have suddenly disappeared except for a single moon with an ocean of blood. Although the technology here comes from hard science fiction, the scenario is entirely mystical. The ocean floor contains mysterious artifacts (which I won’t spoil) and something that might be an entity—or, it could all be an oxygen-deprivation hallucination. There is some body horror, some monstrous visions, a blood-soaked cosmic climax, and no clear resolution. The lack of explanations would not be a problem if we cared about the protagonist in more than a theoretical sense, but it’s hard to become engaged with the convict’s plight. We root for humanity to survive more out of a sense of general obligation to the species than because the movie has caused us to care about this particular band of plucky survivors. So, in short: play the game first. If you want more, see the movie. Don’t reverse the process.
Iron Lung is currently available for rental or purchase solely on YouTube.
WHAT THE CRITICS SAY:
(This movie was nominated for review by “Anonymous,” who suggested it “[h]as enough questions about what f***ed up stuff we’re seeing is real or not, and ends with one of the goriest climaxes in all of film with a battle with a sentient ocean of radioactive human blood..” Suggest a weird movie of your own here.)