Antriksh mein hatya

Two female astronauts Roshni and Alka, are on a mission in space, when Alka hallucinates about her mother calling out to her, loses her grip & almost floats out of control. The two ladies break into an argument over this and refuse to work together. Later, her colleague Roshni apologizes & invites her to go back into space with her. However, the hatch breaks lose & Alka falls into space. Now, Roshni is accused of having opened the hatch deliberately. What exactly happened?