Underwater sounds are a staple of online video because they instantly signal a change of environment without any explanation. Creators use this kind of muffled, bubbling audio for swimming and diving clips, ocean documentaries, ASMR-style relaxation edits and comedic moments where a character feels overwhelmed or out of their depth. Its short length makes it easy to drop into transitions, reaction videos and short-form edits, and its recognisable submerged texture has kept it popular across social platforms long after generic water effects became common in editing libraries.