Is Markiplier’s ‘Iron Lung’ a Masterpiece or Just 80,000 Gallons of Blood?

Movie Review, News Published: 3 min read Mayur Shinde
Iron Lung Review

The internet is buzzing with a single question: Can a YouTuber actually save the indie film industry? After months of anticipation, Mark “Markiplier” Fischbach’s Iron Lung has finally surfaced, and it’s doing much more than just breaking the internet-it’s breaking records.

Thinking of catching this underwater nail-biter? Here’s the lowdown on whether Iron Lung lives up to the hype before you head to the theater.

The Hook: A Submarine Built on Hype and Blood

The air in the theater was thick, and I’m not just talking about the popcorn. There’s an electric curiosity surrounding Iron Lung, especially after reports that Markiplier used over 80,000 gallons of fake blood-shattering the record previously held by 2013’s Evil Dead. This isn’t just a movie; it’s a $50 million box office phenomenon that started as a grassroots plea to local theaters.

The Plot: No Stars, No Hope, Just Blood

Set in a terrifying future where every star and planet in the universe has vanished-an event known as the Quiet Rapture-humanity’s remnants cling to life on decaying space stations. You follow Simon (played by Fischbach), a convict promised freedom if he can navigate a rickety, windowless submarine through a literal ocean of blood on a desolate moon. The catch? The sub is welded shut from the outside. You only see what the grainy, slow-shutter camera shows you. It’s a minimalist nightmare that asks: what’s worse, the monster outside or the crushing claustrophobia within?

Performances & Direction: A Solo Descent

Markiplier doesn’t just star; he wrote, directed, and edited this descent into madness. As a critic, I went in skeptical, but his portrayal of Simon is surprisingly grounded. He avoids the “influencer” traps, delivering a performance defined by frantic breathing and a simmering, quiet desperation.

Caroline Kaplan provides the emotional anchor as Ava, the voice on the radio. Their chemistry is purely auditory, yet it carries the weight of a world that has forgotten what sunlight looks like. Fischbach’s direction is patient-sometimes too patient-but he has an undeniable eye for framing terror in tight spaces.

Technical Excellence: The Sound of Dread

If you aren’t watching this with a top-tier sound system, you’re missing half the movie.

  • Audio: The sound design is the true antagonist. Every groan of the hull and drip of blood feels like a personal threat.
  • Cinematography: Philip Roy turns a single, cramped room into a shifting landscape of shadows. The use of the external camera’s “still shots” to reveal horrors is a brilliant nod to the game’s mechanics.
  • VFX: While the budget was modest, the practical effects are visceral. That record-breaking blood isn’t just a gimmick; it creates a suffocating, tactile atmosphere that CGI simply cannot replicate.

The Verdict: An Independent Triumph

Iron Lung is a punishing, slow-burn experience that won’t be for everyone. If you’re looking for a fast-paced slasher, this isn’t it. But as a masterclass in atmospheric dread and a middle finger to the traditional studio system, it’s essential viewing.

Final Rating: 4/5 Stars

FAQ
How much did Iron Lung make at the box office?
As of March 2026, Iron Lung has grossed over $51 million worldwide against a production budget of roughly $3.6 million, making it one of the most profitable indie films of the year.
Is there a post-credits scene in Iron Lung?
Without spoiling the ending, the film stays true to its bleak tone, but there are subtle audio cues during the credits that fans of the game’s lore will want to stick around for.
Will there be an Iron Lung sequel?
While Markiplier hasn't confirmed a sequel, the film’s massive commercial success and the expansive mystery of the "Quiet Rapture" leave the door wide open for future stories in this universe.