Dr emil chynn was one of the first medics at the scene when the first plane crashed into the twin towers at just after 9am on september 11 2001.
Twin towers roof rescue.
Rare video from ground zero on 9 11.
The roof of the south tower said hayes was totally obscured.
Only 29 minutes passed between the two world trade center towers falling.
Pasquale buzzelli a survivor who claims to have been on the 22nd floor of one of the collapsing towers lived through the fall with only minor injuries.
Hovering just 300ft above one of the twin towers the camera peers down on to the burning roof and captures the thick clouds of black smoke billowing out after the planes have gone in.
Roof is not safest option though some people were rescued from the world trade center s roof after the 1993 basement garage bombing fire evacuation plans for the buildings never included a rooftop escape.
In one of the buildings police helicopters could have landed on the roof to take people to safety.
The california 9 11 memorial in clovis will unveil a m.
But the doors to the roof were kept locked because a similar rescue in 1993 when a bomber tried to destroy the towers was slammed as a publicity stunt by fire bosses and the port authority which owned the centre the wall street journal.
The rescue effort continued round the clock.
Clovis california ksee kgpe wednesday marks 18 years since nearly 3 000 lives were lost in the terrorist attacks on sept.
Genelle guzman mcmillan another survivor.
The original world trade center was a large complex of seven buildings in the financial district of lower manhattan new york city united states it opened on april 4 1973 and was destroyed in 2001 during the september 11 attacks at the time of their completion the twin towers the original 1 world trade center at 1 368 feet 417 m.
Fbi agents firefighters rescue workers and engineers work at the pentagon crash site on september 14 2001 where a hijacked american airlines flight slammed into the building on september 11.