The Reaper Leviathan is one of the most recognizable hostile creatures in Subnautica, the survival game released by Unknown Worlds in 2018 after earlier early access builds. Its roar became memorable because players often hear it just before an attack in open water, making it a natural fit for fear-based edits. Online, the sound is widely used in gaming compilations, ocean phobia memes and clips about sudden dread, especially when something huge or threatening appears out of nowhere.