Trinity and Beyond (1995) watch online

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.

Source: Wikipedia (CC BY-SA)