This recording is credited to Mark Cottle and was made as a demo of the OSCar synth, recreating the familiar active sonar pulse used by submarines and ships to locate objects underwater by bouncing sound off them. The synthesised ping captures that distinctive ringing echo without being a field recording from a real vessel. Online, creators adopted it as a shorthand for searching, tracking and underwater detection, and it now appears in edits, games and memes whenever a scene needs instant naval or deep sea meaning.