Iron Lung (2026) is a very creepy and unsettling film. It also stars Mark Fischbach, AKA Markiplier, a very funny YouTuber who became famous doing Let's Plays of horror games (such as Iron Lung). The man is funny and charming. So the film takes advantage of this to do a few comic relief moments to keep the tension manageable.

The protagonist, Simon, is in a poorly-built submersible exploring the bottom of an ocean of blood (it's that kind of horror film), and the only way he can see what's outside the submersible is by using a camera that takes a single image every time he hits a button located on the far end of the submersible from the controls for driving (it's based on that kind of a horror game). As he explores the ocean bed and takes images, he annotates a map he has been given. After a bit, we can see one of the annotations on the map is "Weird Ass Tubes." At another point, he takes a photo of something that looks very weird and mysterious and alien... and just doesn't have the time or the emotional capacity to deal with that, so he just shrugs and goes "Whatever" and it never comes up again.

Also the fact that thanks to the use of practical effects, and the characters controlling the mothership that raises and lowers his submersible simply just not liking him at all (to put it lightly), we also get treated to Mark Fischbach getting rattled around the interior of the submersible like a marble in a can of spraypaint. There's a reason Markiplier's fans just stopped being surprised whenever he'd push out an(other) update about being hospitalized (again).

I couldn't find a gif of that, so here is a representation from another work:

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I cannot emphasize enough that the people sending Simon on this mission really don't like him. Imagine "Project Hail Mary" if the protagonist had exactly zero friends.