Straight Line (Russian: Прямая линия) is a 1967 Soviet drama film directed by Yuri Shvyryov.
Set in the mid-1960s in the USSR, the film tells the story of Vladimir Belov, a 23-year-old physicist working at a classified research institute involved in atomic testing.
Under the leadership of the esteemed scientist Neslezkin, who lost his family during World War II, Belov’s team successfully develops a groundbreaking weapon.
However, during testing at a military range, two soldiers tragically lose their lives, casting a shadow over the project’s success.
There, the facility’s director reassures him, attributing the deaths to the soldiers' own negligence—they had been smoking in a prohibited area.