Crashfish are hostile creatures in Subnautica, the underwater survival game released by Unknown Worlds Entertainment in 2018. They nest in sulfur plants on the ocean floor and swim straight at the player before detonating, making them one of the game's most memorable early threats. Clips of the explosion spread among players sharing jump-scare moments, failed dives, and funny deaths, and the sound is now reused in gaming edits, reaction videos, and memes to signal a sudden, self-inflicted disaster.