The Echo of Terror

A person in a gas mask and dark clothing sits in a car, raising a hand in a gesture, as the scene shifts to a close-up of a hand holding a red and blue snack bag, then to two figures in blue and black gear with gas masks standing in snow, one raising an arm, followed by a figure in a white suit and gas mask being held by a figure in black, then a view of people standing at the edge of a pool, and finally a close-up of a person's face in profile.