Previously unreleased footage shows the moment the World Trade Center Twin Tower buildings in New York City collapsed nearly an hour after being hit by commercial airliners.

The never-before-seen footage uploaded 23 years after the terror attacks shows the towers engulfed in smoke shortly before they fell in free-fall into their own footprints, much to the horror of New Yorkers and onlookers across the globe.

In the description on his YouTube video posted July 23rd, uploader Kei Sugimoto wrote, “Footage I filmed of the World Trade Center Collapsing on 9/11/2001. Filmed from the roof of 64 St Marks Place in NYC on a Sony VX2000 with teleconverter. For historical archival purposes only.”

In the comments section, Sugimoto explained why it’d taken him so long to release the footage, writing,

“I was cleaning my closet and found boxes full of Hi-8, Digital-8, and DV tapes.

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“When trying to play them back I noticed that maybe about a 3rd of them had demagnetised over time and were either blank, or suffering from major data corruption.

“After researching online I learned that video tapes are not immune from age even when stored in ideal conditions, so I franntially [sic] started to digitise them. Thus I’m just uploading the video now.”

Highlighting the footage this week, architect Richard Gage, the founder and former CEO of Architects & Engineers for 9/11 Truth, pointed out that the footage shows white flashes, presumed to be thermal charges, which are consistent with controlled demolition techniques.

Here’s an hour-long version of Sugimoto’s video: