Movies/TV series about the Manhattan Project are plentiful:
1) “Above and Beyond” (1952)
https://www.imdb.com/title/tt0044324/?ref_=fn_al_tt_2
2) “Oppenheimer” (TV mini series) (1980)
https://www.imdb.com/title/tt0078037/?ref_=nv_sr_srsg_3_tt_5_nm_3_q_oppenh
3) “Enola Gay: The Men, the Mission, the Atomic Bomb” (1980)
https://www.imdb.com/title/tt0080689/?ref_=nm_flmg_t_37_act
4) “Day One” (1989)
https://www.imdb.com/title/tt0097159/
5) “Fat Man and Little Boy” (1989)
https://www.imdb.com/title/tt0097336/?ref_=nm_flmg_t_19_act
6) “Hiroshima: Out of the Ashes” (1990)
https://www.imdb.com/title/tt0099772/?ref_=nv_sr_srsg_6_tt_8_nm_0_q_hiroshima
7) “Hiroshima” (1995)
https://www.imdb.com/title/tt0113309/?ref_=nv_sr_srsg_3_tt_8_nm_0_q_hiroshima
A few years ago a series called Manhattan