In a post-apocalyptic future after "The Quiet Rapture" event, a convict explores a blood ocean on a desolate moon using a submarine called the "Iron Lung" to search for missing stars/planets.

Set in a post-apocalyptic future where an event known as "The Quiet Rapture" caused all known stars and habitable planets in the universe to disappear, a convict is sent to search an ocean of blood discovered on a desolate moon, using a small submarine nicknamed the "Iron Lung".—Ender_News