SURVIVOR: A digital serial novel in 12 episodes. Episode 5.

Commander Ryan Nash and his friend Jabo have become separated from their friends. Jabo, who has been transformed into a cyborg, half men and half machine, implores Ryan to kill him. For he is afraid of losing his fight against the program in his head and turning into a killing machine. But then Ryan and Jabo are attacked by a real monster: the "Long", a man-eating behemoth. During their headlong flight through the corridors of the subterranean city they meet a mysterious man called Nubroski, a Russian. He introduces himself as a former assistant of Dr Kasanov, the mastermind behind the SURVIVOR mission. And he has his own plans for Ryan Nash and his crew.