Supposedly under Cameron Village, NC. Appears real to me. Not a full size sewer, just one of those small feeder pipes. Notice the last one is hanging on to something near its top in the seam.
I guess some people are claiming they could possibly be a bryozoan, but every pic I was able to find of one doesn't look anything like in the video. Possibly a colony of worms? Whatever it is, let's hope they don't learn how to crawl against the water current...
Edit: Original link removed by user, added a working video link.