UNITED STATES – SEPTEMBER 11: The World Trade Center was destroyed by two planes containing hijackers. Firefighter Kevin Shea of Ladder 35 lies semi conscious in debris field with Firefighter Ritchie Nogan of 113 standing over him. Shea was the only survivor of his unit. He was carried out by Nogan, two EMS workers and photographer Todd Maisel. (Photo by Todd Maisel/NY Daily News Archive via Getty Images)