On Sunday, 343 firefighters from across Texas donning their heavy coats and gear gathered in downtown Dallas to honor the lives of New York firefighters who died on 9/11.

They climbed 100 flights of stairs at Dallas's Renaissance Tower to commemorate the lives of 343 from the New York Fire Department who died saving others on that day. Each carried the name and photo of one of their department brethren.

"It's kind of an honor because he was a hero," said Jacob Manceaux of the Port Naches,Texas Fire Department. "He went to go up and save people and he never came back. I'm doing this to finish his climb."

To commemorate the tenth anniversary, more than 16,000 firemen around the world participated in a similar climb to remember the fallen of 9/11.

(WATCH the video below, or read the story from SMU-TV)

VIDEO: Dallas 9/11 Firefighter Stair Climb from SMU-TV on Vimeo.