I have different visions regarding this particular atmosphere. It doesn't really evoke me a submerged world in my mind, but I have images of a forgotten land, or a dreaded structure imbued in darkness. Some people could find this soundscape meditative, safe for the sound effects popping out of nowhere. However, some subtle variance would make the experience a bit more interesting and enjoyable, as an 11 minutes track may be gargantuan in most people's eyes. Right now, the atmosphere is pretty minimalist in itself and almost texture-exclusive. Also, do you use Reason? I kind of recognize some sounds... it might be just my impression.