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They risked their lives to capture on film hundreds of blinding flashes, rising fireballs and mushroom clouds.

The blast from one detonation hurled a man and his camera into a ditch. When he got up, a second wave knocked him down again.

Then there was radiation.

While many of the scientists who made atom bombs during the Cold War became famous, the men who filmed what happened when those bombs were detonated made up a secret corps.

Their existence and the nature of their work has emerged from the shadows only since the federal government began a concerted effort to declassify their films about a dozen years ago. In all, the moviemakers fashioned 6,500 secret films, according to federal officials.

Today, the result is a surge in fiery images on television and movie screens, as well as growing public knowledge about the filmmakers.

The images are getting “seared into people’s imaginations,” said Robert S. Norris, author of “Racing for the Bomb.” They bear witness, he added, “to extraordinary and terrifying power.”

Two new documentaries, “Countdown to Zero” and “Nuclear Tipping Point,” feature archival images of the blasts. Both argue that the threat of atomic terrorism is on the rise and call for the strengthening of nuclear safeguards and, ultimately, the elimination of global arsenals.

As for the cameramen, there aren’t that many left. “Quite a few have died from cancer,” George Yoshitake, 82, one of the survivors, said of his peers in an interview. “No doubt it was related to the testing.”

The cinematographers focused on nuclear test explosions in the Pacific and Nevada.

Electrified wire ringed their headquarters in the Hollywood Hills. The inconspicuous building, on Wonderland Avenue in Laurel Canyon, had a sound stage, screening rooms, processing labs, animation gear, film vaults and a staff of more than 250 producers, directors and cameramen — all with top-secret clearances.

When originally made, the films served as vital sources of information for scientists investigating the nature of nuclear arms and their destructiveness. Some movies also served as tutorials for federal and congressional leaders.

Today, arms controllers see the old films as studies in gung-ho paranoia.

“They have this very odd voice,” said Mark Sugg, a film producer at the World Security Institute, a private group in Washington. “You and I would be appalled that some hydrogen bomb vaporized a corner of what used to be paradise. But they’ve got a guy bragging about it.”

A 2006 book, “How to Photograph an Atomic Bomb,” explores the nature of the cameramen’s secretive enterprise, its pages full of declassified photographs and technical diagrams.

“They’re kind of unrecognized patriots,” said Peter Kuran, the book’s author and a special-effects filmmaker in Hollywood. “The images that they captured will, for a long time, be a snapshot of what our last century was like.”

After inaugurating the nuclear age and dropping two atomic bombs on Japan in World War II, the United States threw itself into expanding its nuclear arsenal. New designs required test detonations to make sure they worked properly. Between 1946 and 1962, the nation set off more than 200 atmospheric blasts.

The secret film unit, established in 1947 by the military, was known as the Lookout Mountain Laboratory. The lab, just minutes from the Sunset Strip, drew on Hollywood talent and technology to pursue its clandestine ends.

“The neighbors were suspicious because the lights were on all night long,” Yoshitake recalled.

Film historians say the unit tested many technologies that Hollywood later embraced, including advanced lenses and cameras, films and projection techniques.

The cameramen fanned out to governmental test sites in the South Pacific and the Nevada desert, their job to chronicle the age’s fury. It put them as close as two miles from the blasts.

The visual records helped scientists do everything from estimating the size of nuclear detonations to measuring their destructive power. Mock towns went up in flames.

Yoshitake recalled documenting what a fiery explosion did to pigs — whose skin resembles that of humans.

“Some were still squealing,” he said. “You could smell the meat burning. It made you sick. I thought, ‘Oh, how terrible. If they were humans they would have suffered terribly.’”

The cameramen were allowed to simply witness, not photograph, their first hydrogen bomb explosions, which were roughly one thousand times more powerful than atomic blasts. The goal was to get them accustomed to the level of violence.

“The purple glow in the sky — that was so eerie,” Yoshitake recalled. “And we were not even close, about 20 miles way. It filled the whole sky.”

The guarded enterprise lost its subject matter in 1963 when the superpowers agreed to move all testing of nuclear weapons underground, ending the spectacle of atmospheric blasts and what governments had come to regard as serious risks to human health from radioactive fallout.

In 1997, Hazel R. O’Leary, the secretary of energy under President Bill Clinton, sought to declassify the old movies.

At a news conference, O’Leary called the archive “a treasure trove” and promised to release the films after they had undergone any needed redactions for purposes of national security. Nuclear specialists say the shape and size of a weapon — especially a hydrogen bomb — can reveal design secrets.

The department’s goal was to make public as many as 20 films a month and complete the declassification project in five to seven years.

Late in 1997, an event in Hollywood at the American Film Institute honored the filmmakers. Present were some two dozen of the survivors.

“You had to have the cameras running before the detonation,” Douglas Wood, 75, a cinematographer, told a reporter at the gathering. If not, he said, the blinding flash “would burn the film and jam the film gate.”

Kuran, the filmmaker, organized and filmed the Hollywood event. Impressed with the skill and courage of the cinematographers, he mixed the event footage with declassified bomb imagery to produce “Atomic Filmmakers,” a video he sells on his website, www.atomcentral.com.

The declassifications stopped in 2001. The arrival of the Bush administration, and an outbreak of atomic jitters after the terrorist attacks on New York City and the Pentagon, combined to bring about the program’s demise.

Today, the Energy Department says it has released publicly some 100 movies from the vast stockpile, which the military controls. “What you see is what we have,” said Darwin Morgan, a department spokesman in Las Vegas.

A page on the department’s website features links to clips from the films that visitors can view free of charge and sells full versions for $10, plus shipping. It calls them “an enduring, awesome visual documentation of the power and destruction of nuclear weapons.” Many are available free on YouTube under the search heading “declassified U.S. nuclear test film.”

Yoshitake, the cameraman, said the release and restoration of the images were healthy developments because their disclosure improved public understanding of the nuclear threat.

“It’s a good thing to show the horror,” he said.

And he wondered — now that the Cold War is over — why advanced nations still retain more than 20,000 of the deadliest of all weapons.

“Do we need all these bombs?” Yoshitake asked. “It’s scary.”