What are those tunnels and whats the purpose behind them? Also -- why so deep -- 800ft? I think (and may be wrong) digging them shallower would be cheaper. 6B vs f.e. 4B -- that's a lot of cheddar.

Also, someone mentioned "garbage" being underground citizen. I think that's wrong. While we have water, electricity and sewage running underground, the fact that garbage is not a part of this rail is really dissapointing. If you live upper west side, try to walk some broadway on a very hot day, before Thursday's garbage pickup. Your eyes will run wet from all the stink from garbage mountains packed everywhere. Literally there are streets where kids are forbidden to be outside because of all the smell and I assume airborne crap. Note, of course you won't see it downtown (the tourist area) where trash is picked up every day. Why there is no major garbage shute system across the city, no idea...