Maintenance works on the Trans-Korean Main Line, near the border with Rasŏn. Before Doomsday, Rason was used by the
Soviet Union as an alternative
warm-water port in case
Vladivostok was unavailable. The Soviet naval facilities were built starting in 1979, and are used as a shared base by the Soviet Navy (Вое́нно-морско́й флот СССР (ВМФ)/
Voyénno-morskóy flot SSSR (VMF), and the Korean People's Army Naval Force ( 조선인민군 해군/
Chosŏn-inmingun Haegun)