September 11 21st anniversary: 9 incredible stories of people who survived

Guzman-McMillan and her colleagues decided to take the staircase down after the first plane hit the North Tower of the World Trade Center. When they reached the 13th floor, the tower collapsed on them.

Guzman-McMillan, now 51, was the lone survivor among her colleagues and was miraculously rescued after spending 27 hours trapped under the rubble.

Source: startTV

During his descent from the 84th floor of 2 World Trade Center, where the office of his international brokerage firm was, Clark stopped to save the life of a man — Stanley Praimnath — who was trapped.

Praimnath was pinned underneath some debris behind a wall that had stood firm, and Clark, who is 75, was able to hook his arms around Praimnath and lift him over.

Source: PBS, Independent

Captain Jay Jonas, and five of his firefighters from Ladder Company 6, were exiting a search and rescue mission in the North Tower shortly after the South Tower collapsed.

While Jonas and the unit were on their way down the stairs, they spotted Josephine Harris — a 59-year-old bookkeeper who had fallen and was unable to continue her descent. They stopped to help get her to safety.

Shortly after, the North Tower collapsed around them, but Harris and the men were not crushed.

"You cannot say that something that happened to you is a miracle," Jonas told The New York Times. "But we had the courage to do what we did, and you can say that if she was not there for us to save her, we probably would not have made it."

Source: The New York Times

Manning was arriving for work at the North Tower moments before the first jet crashed into it. As she entered the elevator that would take her to her office, she was met by a fireball.

She was burned on over 80 percent of her body and spent almost two months in a medically induced coma. Manning made a recovery that surprised doctors.

In 2013, then-President Barack Obama cited Manning as an example of American people who "bounce back."

In July 2016, she gave a widely-acclaimed speech at the Democratic National Convention.

Sources: Newsday, The New York Times, The Washington Post

Texas State Senator Brian Birdwell, 61, was a lieutenant colonel in the US and was working at the Pentagon when it was struck by the hijacked American Airlines Flight 77 on September 11, 2001.

He was left with severe burns over 60 percent of his body and was the lone survivor in the E ring at the crash site, Birdwell told KWTX.

Birdwell was awarded a Purple Heart in 2004 and spent the 13 years after that running a non-profit organization to support critical burn survivors.

In a June 2010 special election, Birdwell was elected to the Texas State Senate. He has been re-elected three times since.

Sources: The Texas Senate, KWTX

Rudder, who was in the US Marines, was at the Pentagon on September 11, awaiting her promotion ceremony. She was unscathed in the attack and was able to help others get to safety.

She returned to the Pentagon two days later to assist in removing victims' remains and, during this effort, got her ankle trapped and crushed beneath a concrete barrier.

After several reconstructive surgeries, her leg was eventually amputated in 2014.

In 2016, Rudder competed in the international Invictus Games for wounded and injured servicemen and women. The 9/11 survivor won six medals.

Source: Tampa Bay Times

After seeing the first plane crash into the North Tower, Jimeno — a rookie officer with the Port Authority Police Department — rushed to the World Trade Center with 20 other officers.

Shortly after he arrived, the South Tower collapsed, and Jimeno was trapped under 30 feet of debris. He was one of two officers to be pulled out of the rubble alive but spent weeks in the ICU undergoing 13 surgeries.

Source: CBSN New York

McLoughlin, a sergeant with the Port Authority police, was trapped with Jimeno under the rubble. He tried to use his radio to send a final message to the rookie officer's heavily pregnant wife, asking that she fulfill Jimeno's wish that they name their unborn child Olivia.

McLoughlin survived being buried underground for 22 hours. After being placed in a medically induced coma for six weeks, he returned to Ground Zero four months later to witness the removal of "the final column" at Ground Zero.

Source: CBS News