The Tunnel to Towers Run & Walk is an endurance event held to honor the memory of Stephen Siller, a New York City firefighter who died on September 11, 2001, and to recognize the sacrifices of first responders and military personnel. Participants can run or walk, and the event welcomes strollers, wheelchairs, and those wearing firefighter or military gear. The event includes simple awards, water stations, and on-site medical support. Registration can be transferred but is non-refundable. Participants are encouraged to fundraise, and donations and sponsorships are accepted to support the Tunnel to Towers Foundation.