Deeply atmospheric stuff. Goes on a while too. Quite a while.
It comes in two parts. First part is outside the rooms, second part is inside them, moving slowly. Always watching. There is stuff in the shadows but you never know if it's filled with malice or not. It's very reminiscent of the type of music I played with Steven and Greg, to some extent, with the sounds of shadows moving within shadows and something at large within the stygian bleakness. You can't really work out what it is - it's just there.
This stuff is crying out for a video, but until then the sound will suffice. Don't worry - you'll know when part one becomes part two.