You've entered an enormous building scoured by ocean tides and haunted by hulking machines, slowly rusting away. It looks like the set for a post-apocalyptic movie, but it's actually a real-life Soviet submarine base, left over from the Cold War.

Kraternyy, a secret base (1987-1994) on an uninhabited volcanic island named Simushir, Kuril Islands

(via Austronesian Expeditions)

Object 825, a hydraulic engineering structure for nuclear defense and a shelter for fourteen submarines in Balaklava, Ukraine

(via English Russia and samnamos)

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Bunker Alsou or Object 221 (also known as PCP BSF, Protected Command Point Black Sea Fleet) in the Crimea

(via Alexfotos)

A nuclear shelter for Pacific Fleet submarines, Pavlovsk, Russia

(via Kata-Katafota)

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A base in Hara, Estonia, built between 1956 and 1958, used until 1991

(via Dmitri Korobtsov, Andrea Luht and Syn)

Liepaja, an ice-free harbor in the Baltic Sea, once a submarine base for 16 submarines and a nuclear deposit. There was also a closed town named Karosta.

(via Andrius Vanagas, Hugo Kintzler, Mika Meskanen, Pexi from Helsinki Rock City, Rats'n'Ruins and Cold War Sites)