The secret laboratory was destroyed by aggressive activists who advocated stopping experiments on animals. But experiments were carried out on people in the laboratory and as a result of the pogrom, the zombie virus was released, which people learned about over time. In Bloodbound Zombie Escape, you went to the laboratory to find an antidote for the virus. Having made your way inside, you find yourself trapped, since for security reasons the doors there are locked automatically. Surely it is possible to get out of the room, but the matter is complicated by the presence of zombies that remained in the laboratory, so you will have to hurry up in searching and escaping in Bloodbound Zombie Escape.