Grid 16 doesn't just have a sewer, they have a sewer that is forcing us to rethink some of our theories. Oddly enough it flows roughly northwest down to the southeast -- in other words, away from the sea. More importantly, it is forcing us to reassess some of our theories about what we believed to be a Crusader cut through bedrock on the North Tell to create a moat for a 13th century fortress. Questions, questions, and more questions. It's a good thing we have four more weeks to find some answers.
Who doesn't love digging a sewer?