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Newly declassified films show US nuclear tests

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National Laboratory is scanning and re-analyzing thousands of old nuclear test explosion films

A sample of the mesmerizing explosions have been made public and are on YouTube

(CNN)After decades in their film cans, thousands of nuclear testing explosion films are finally seeing the light of day, thanks to a project by the Lawrence Livermore National Laboratory (LLNL).

Over a period of about 20 years after the end of World War II, the US conducted 210 atmospheric nuclear tests. Each was captured by multiple cameras, rolling at around 2,400 frames per second.

A handful of the estimated 10,000 mesmerizing test films have been declassified and the National Laboratory, custodians of the material, has uploaded more than 60 videos to a YouTube playlist.

The project to digitize the aging film came just in time. Greg Spriggs, a nuclear weapons physicist at the laboratory who's in charge of the project, says the films were decomposing "to the point where they'll become useless."

The film is made of organic material and each film canister he cracked open gave off a strong odor of vinegar, he says, indicating the decomposition had already begun.

Jim Moye, a film expert with four decades of experience in the motion picture industry who was brought on to the project, says the films are remarkably well preserved, given that they weren't stored particularly carefully.

About 65% of the films have been located from the various top-secret bunkers where they were stored, and of those, more than two-thirds have been scanned. Only about 500 films have been actually analyzed so far, with modern techniques giving far more accurate readings of the explosions than the nuclear physicists of yesteryear were able to muster.

The released tapes include footage of atmospheric tests, such as Operation Dominic, which is filmed as a expanding sphere, through the clouds, as well as surface tests.

Looking at the films, the team found that a lot of the information Spriggs was interested in hadn't even been analyzed back in the 1950s, and the analysis that was done wasn't particularly accurate -- inaccuracies were found in as much as 20-30% of the data.