Now that Iron Banner is active and you can get to that area in the tower that is normally closed, there is also a spot almost right in the middle of that huge area where you can hear clear looping radiostatic and other odd noises, almost like a moan. Wish i could pinpoint that area better, but if you slowly walk that catwalk that has water on each side, you should come to a spot eventually that makes the noises. I found it during the Queens Wrath event some month or two ago. Use some good headset if possible, easier to hear.