A sound i initially made for scp containment breach's ambiance sounds when i had first had the zoom h6 (2019 december, i regularly sound mod old games to gain learning experience of the encoding, the resampling quality of that engine and the internals and since then i've improved in many places). The actual recording is the pressure sound of water going down its sinkhole, filtered as to "muffle" the sound due to the design being that behind a wall and catching the attention of the player likely leading to their death by scp-173 but also was done to boost its bass and it gives a sort of comfortable, releasing feel.
Author: Magnuswaker
