Iron Lung took the horror game community by storm after its launch, prompting well-known content creators to stream their experience. In Iron Lung, you play as the pilot of a small submarine traversing through an ocean of blood on an alien moon. Following its initial fame, the game had a pretty steady number of sales, though with the Titanic submarine recovery effort in the news, Iron Lung has once again spiked in popularity, and developer David Szymanski has taken to Twitter to discuss it.