This article or section includes speculation, observations or opinions possibly supported by lore or by Blizzard officials. It should not be taken as representing official lore.
There is a kind of maw at the bottom of the water in the center of the quarry which moves and seems to be alive. Perhaps one of the "thousand maws" of the Old GodYogg-Saron or a different Old God. It looks similar to and shares the model with C'Thun. It is possible to swim into the mouth and past it. The mouth seems to disappear with only the corners remaining.