Tens of thousands of people streamed through the Brooklyn Battery Tunnel on Sept. 29 for the 12th annual Tunnel to Towers 5K Run and Walk in honor of those who died on 9/11. The run began as a way to commemorate Stephen Siller, a firefighter who ditched his truck in Red Hook, Brooklyn so that he could get across the East River to the World Trade Center in Lower Manhattan on 9/11. He made the trek wearing 75 pounds of protective gear. Siller died when the second tower collapsed that morning, but his memory and those of other firefighters and first responders are honored as every year as runners follow in his footsteps.