Water in the Dark

Tension that will not release is the whole job of a dungeon passage, and this gives it to you without saying what comes next. It leaves long stretches of near silence, so a quiet threat or something waiting off screen can run under it. It builds unease and lets the viewer supply the reason. It comes as an instrumental WAV file by instant download, with no royalties, under a granted licence that sets out what you can do with it.