Then do it the other way around, using the sewage lines. Tack the line to the top with some bio-mimetic glue, inspired by the stuff which enables fouling of shi

Then do it the other way around, using the sewage lines. Tack the line to the top with some bio-mimetic glue, inspired by the stuff which enables fouling of ship-hulls and all other things under water, first by microorganisms building biofilms, then the larger colonizers following. (ShitNet! Up Your's! (SCNR))