After the attack on D6, Artyom becomes disillusioned with the constant infighting and corruption within the Metro and leaves the Spartan Order. He soon becomes obsessed with proving that other human survivors exist outside of Moscow and makes numerous dangerous expeditions to the surface, much to Anna's concern and Miller's frustration. However, on one such expedition with Anna, they witness a working train running on the surface. Before they can follow it, they are captured by Hansa soldiers along with a couple of people who claim to be from outside of Moscow. The Hansa soldiers execute the other prisoners and Artyom is shot and left for dead. Surviving the gunshot, Artyom follows the soldiers to their base to rescue Anna, and in the process inadvertently destroys a signal jammer that was blocking all communications going in and out of Moscow. Radio transmissions from all over the world begin to be picked up, and Artyom and Anna realise humanity has not gone extinct. They escape by stealing one of Hansa's trains with the aid of a defected Hansa train engineer called Yermak.