Based on David Szymanski's sci-fi submarine simulation, the YouTuber's debut film screams possibility.

I sealed myself in and plunged into Markiplier's world.

Markiplier shows a lot of promise as a filmmaker with Iron Lung, but its sluggish pacing bogs it down a few notches.

Markiplier's 'Iron Lung' could turn out to be a sleeper hit, as the horror video game adaptation has landed a near-perfect Rotten Tomatoes score.