One of the songs composed by Nakano for FFX, it's a very atmospheric piece fitting for any kind of ruined/ancient places, better if underwater.
It includes an option in the file for usage in water/non-water levels. By default it's for water levels, but if used in a non-water one, it's recommended to change it (it prevents the used SFX channel from cutting out when swimming).
Not compatible with "Bonus End" and Thunder SFX/Blarggs. The song is pretty tight on memory, so if it doesn't insert lower the echo delay to $05 (or remove an additional sample from the sample group).