The third episode of Helix picks up right where the second left off. Day 3 begins with Alan finding his ex-wife Julia passed out on the floor of the shower after being attacked by Alan’s infected brother Peter. Julia tells him that she doesn’t remember what happened to her and she’s just overworked. Alan goes to wait for her in the hallway when he hears something bump in the air vents. When he follows the sound to a lab Peter drops down behind him. He surrenders himself then passes out.Sarah and Doreen are watching over the scared locals, one vest wearer in particular speaks up, which means he promises to be a troublemaker later on. Behind the glass Daniel, Hataki and Balleseros are watching and discussing recent events. Daniel says they are still looking for the three people who escaped the day before and Balleseros reveals that two more people have become infected. Then Alan wheels Peter into containment.Hataki is worried that Peter will escape again, so he suggests putting him somewhere more secure. Daniel gives Alan and Balleseros a tour of a lower level that was abandoned years ago. It has since been used for dangerous experiments, including nuclear research. When Daniel confirms that the area has been tested for radiation Alan says that he wants to turn the floor into an isolation area for normal infected and vectors, which is the name given to those like Peter who are actively trying to spread the virus.