The Day After Trinity
Starring Paul Frees, J. Robert Oppenheimer, Hans Bethe, Haakon Chevalier, Isidor Isaac Rabi, Robert Serber, Leslie Groves, Frank Oppenheimer, Freeman Dyson, Holm Bursom
It's a documentary and history movie, and has a rating of 7.8 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from Brazil.