Ixtayul has an insane set of construction pictures over at Metroplus today-- "Remove a few layers of black top, concrete and a little soil and you get some idea of what it takes to service the Wall street area with electricity, gas, water, sewer and communications." Jesus-- it looks like a game of pickup sticks.

Related: National Geographic diagram of street layers, informative Gotham Gazette article on the sewers (large pipes seen above), The Works (amazing diagrams of the sewer, electrical, and steam systems.)