Iron Lung Movie Review: Is Markiplier’s Bloody Passion Project Worth the Dive?

Is this just a vanity project, or a legitimate entry into the sci-fi horror genre? Here is my breakdown of the Iron Lung movie.

The Quiet Rapture

The film stays true to the game's terrifying lore. The story is set after an event known as "The Quiet Rapture," where all stars and habitable planets inexplicably vanished. Humanity survives on space stations, desperate for resources.

Markiplier plays a convict forced to pilot a rickety, claustrophobic submarine into an ocean of blood on a desolate moon. His goal? Search the abyss. The reward? Freedom—if he survives.

12 Monkeys Meets Submarine Horror

One thing is undeniable: The atmosphere is immaculate.

Since this project was self-funded and independently released, what we see is exactly Markiplier's vision. The set design of the submarine feels incredibly tactile. It channels a specific "analog-futuristic" aesthetic—think 12 Monkeys mixed with garage-built engineering. It feels rickety, dangerous, and authentic.

• Sound Design: The audio work is a standout. The creaking metal and the muffled sounds of the blood ocean outside create a genuine sense of dread.

• Visuals: With zero visibility out of the window (because, well, blood), the film relies on the submarine's internal claustrophobia and grainy sensors.

The Markiplier Show

The cast is minimal. Aside from some voice work (including a cameo that sounds suspiciously like Troy Baker), this is the Markiplier show.

Does he deliver?

• The Rough Start: Initially, the performance feels slightly "overcooked." There is a forced "badass low voice" in the first act that feels unnatural.

• finding the Stride: As the tension ramps up, Markiplier settles in. He is significantly better at portraying terror than confusion. By the third act, when the situation deteriorates, his acting is surprisingly solid. He sells the fear effectively.

Adaptation vs. Gameplay

Here lies the film's biggest hurdle: The Pacing.

Iron Lung (the game) relies on the player’s agency. You are the one blindly navigating, checking coordinates, and solving puzzles. That interactivity creates the fear hook.

• The "Watcher" Problem: Watching a character solve navigation puzzles for the first hour creates a disconnect. Without the controller in your hand, the first half of the movie drags significantly. It feels vague and, at times, boring.

• Lore Dump Issues: The film is light on exposition. After watching, I actually had to search "Iron Lung Lore" on YouTube to fully grasp the depth of the story. A 10-minute lore video ironically made me feel more informed than the entire first hour of the film.

A Faithful Companion Piece

Iron Lung is a mixed bag, but an interesting one. It is clearly a passion project, not a cash grab. Markiplier treats the source material with immense respect, creating a film that serves as a high-budget companion piece for fans of the game rather than an entry point for general audiences.

Pros:

• Incredible sound design and "creepy" atmosphere.

• Faithful to the game's mechanics (X-ray cameras, blind navigation).

• Strong third act with genuine psychological horror.

Cons:

• Pacing drags heavily in the first half.

• Vague storytelling may alienate non-gamers.

• Dialogue mixing can be muddy (subtitles required).

Should you watch it? If you are a fan of the game or Markiplier, this is a must-watch. If you are a general horror fan, it’s worth checking out on streaming for the atmosphere alone, but be prepared for a slow burn.