I have seen a video which shows footage of some of the poor souls jumping to their deaths that day while the audio is a near hysterical woman talking to a reporter saying " They're jumping out the windows, Oh my God, they're just jumping out the windows..."
It is at once gut wrenching and numbing.

Also, there is a very moving documentary produced by two Frenchmen who by fate were filming at a NYC firehouse that day and ended up at the WTC filming in one of the tower lobbies. I remember it has a shot of the firemen carrying out the body Father Mike Judd, the NYFD chaplain who died that day. Watching the firemen flinch at the loud bang made by bodies hitting the pavement outside is something I won't forget.

I have only seen this broadcast once, back around 2002 I guess.

Sadly, we have mostly forgotten about this and with each passing day become more complacent and less concerned about recurrence.

"At what point shall we expect the approach of danger? By what means shall we fortify against it? Shall we expect some transatlantic military giant to step the ocean and crush us at a blow? Never! All the Armies of Europe, Asia and Africa combined with all the treasure of the earth (our own excepted) in their military chest..could not by force take a drink from the Ohio or make a track on the Blue Ridge in a trial of a thousand years.

At what point, then, is the approach of danger to be expected? I answer, if it ever reach us, it must spring from amongst us. It cannot come from abroad. If destruction be our lot, we must ourselves be its author and finisher. As a nation of freemen, we must live through all time or die by suicide"
Abraham Lincoln January 28, 1838