[2][3] In a cafe in Madrid, two random people are shot dead by an unknown sniper when they leave a bar.

The streets are evacuated, and gradually, the rest of the people still alive in the bar come to realize someone in the group is the reason.

Two others who believe to have made no physical contact with the man including Andrés and Sergio join Amparo and together force the five other people down in the cellar at gunpoint.

Nacho realizes the liquid from the bottle is not pooling on the cellar floor but instead has seeped down somewhere and when they remove several pieces of cardboard, they uncover the grate leading to the sewer.

They then hear several gunshots coming upstairs from the bar and deduce the government has stormed in and shot Amparo, Andrés and Sergio dead.

Trini panics again and touches the door to cellar which is red hot, to push it open and burns her hands.

The group waits till the government is gone and heads upstairs to find the interior of the bar burnt down and taped up from the outside.

Nacho finds Sergio's gun and even though it is still hot from the fire, he picks it up and hides it in his pants without telling the others.

Nacho grabs a huge metal pipe and the men all take turns in making the sewer opening larger.

They cover themselves with oil and Nacho, Israel, Satur, and Trini barely manage to squeeze through the small opening to access the sewers.

Once the whole group is down in the sewers, Nacho suddenly grabs Israel and attempts to fight and drown him underwater and also get the gun away from him.

Trini has a moment of realization about the pointlessness of her whole life and so she takes the gun from him and kills herself to minimize the group's quantity with that of the vaccines.

While the three are looking at Trini's body, a now demented Israel comes out of the shadows and hits Satur on the head with a metal pipe and kills him.

Distraught, Elena injects herself with the vaccine and pushes open the grate before climbing out of the sewers and into the streets, where she sees the bar burnt down from the outside.