had taken her classes on tours like this, of the marin sanitation agency s treatment plant. and they would show you from the toilet to the bay the entire process. and so i knew that that necklace was somewhere between somewhere around here. and we just set up and said let s take a chance, let s do a short run to see if we can t recover it. reporter: so you popped open the hole? yeah. reporter: enter bill laneu of the san rafael sanitation district who d received word about ann s missing necklace, and now months later he found it. in the sewer just yards from her house. reporter: what about the ick factor? the what? reporter: the yick. what do you mean the yick? the yuck factor. reporter: it s covered with stuff. oh, yeah. reporter: laneu cleaned it and then hand-delivered the gold chain.