I cut this high quality clip from Trinity And Beyond - The Atomic Bomb Movie / Documentary.
I tried to keep the high definition, limited to 100 meg on here without premium membership ;)

I recommend watching the whole movie as it has the best atomic footage of any i have ever seen and is one of my favorites.. Enjoy the clip ;)

Trinity and Beyond: The Atomic Bomb Movie is a 1995 American documentary film directed by Peter Kuran and narrated by William Shatner. Using restored archive footage, the film traces the development of nuclear weapons and their testing, from America's Trinity test of 1945 (hence the title) to the first Chinese atomic bomb test in 1964. Kuran's commentary on the DVD
version claims that the DVD replaces some of the original footage with
better-quality versions. There are some short special effects sequences
too. The film has also since been released on Blu-ray.
Included is footage of nuclear tests starting with the May 1945 trial run to Trinity (the first atomic bomb), a 100 ton TNT
blast used to scale and calibrate the Trinity device, and ending with
the last U.S. atmospheric nuclear detonation (called Tightrope) of the Nike Hercules air defense missile in 1963. Also included are test series in the South Pacific, and footage of the firing of the U.S. Army's atomic cannon at the Nevada Test Site in 1953, and color images of multi-megaton high altitude air bursts over Johnston Island just before the limited test ban treaty went into effect (banning all except underground detonations) in 1963.
The film's publicity claims that much of the American footage is
newly declassified and previously unseen. Kuran's research brought him
into contact with many of the cameramen who photographed the American
tests, leading to the production of another documentary, Atomic Filmmakers,
which featured their reminiscences of working on the program. A new
patented image restoration process was used for the first time to
improve considerably the image quality of old and fading film stock.