Part 2, Chapter 3 - Tweedledum and Tweedledee

Times Square - http://www.reuters.com/article/2010/05/03/us-timessquare-vendors-idUSTRE64209V20100503

Tunnel Anatomy - http://hamptonroads.com/2009/09/beneath-your-tunnel-drive-vast-system-safe-travel

Holland Explosion - via Google books