Eerie images of an abandoned submarine hideout in Russia show the insides of a base that could be revived if a new war were to break out.
The dark maze of tunnels was supposed to serve as a nuclear shelter for the Soviet submarines of Soviet Pacific Ocean fleet in the mid-1900s, but the hangar never had a chance to be used.
Construction began in the 1960s, but it slowed in the 1980s and the hangar was left unfinished.
The Pavlovsk, Russia, base features two large tunnels joined together by a series of smaller tunnels made large enough for massive submarines to safely travel through.
A group of four friends from Vladivostok, Russia, who go by the name of KFSS, went to the base to see the network of tunnels themselves.