Engineers at Ground Zero, directed by Kalim Armstrong, is a documentary that highlights the little-known role structural engineers played following the September 11, 2001 attack on the World Trade Center. While first responders have been rightfully praised, this film focuses on the structural engineers who ensured their safety during recovery, helped stabilize structures, and prevented the Hudson River from flooding the NYC Subway system. Featuring firsthand accounts, it examines how 9/11 has influenced building design and emergency response to keep the public safe. It is also a film about human nature and people coming together to take care of each other in the aftermath of a traumatic loss of life.

Thanks to The Structural Engineers Association of New York (SEAoNY) for sharing their stories.

TIME has published an abridged version of the forthcoming film to mark the anniversary of 9/11