Constant Mutation

A deadly virus that emerged from one city spread through out the world. It ended up killing more than half of the population . Now people live isolated in their homes while animals roam freely .Its been 120 years now the virus has mutated and become more deadly. As the virus is air borne people move through underground . Their homes are completely insulated and only filtered air can come in.Under these harsh conditions there is a group of people who help people in need , they rescue them from critical situations and also deliver materials from above ground. Their suits are made up of materials on which virus can’t survive for long . They are called FISHKERS