The bunker was filled with vast echoing chambers, remnants of the nation’s Cold War defenses. At an undisclosed location in central Sweden, an urban explorer penetrated a subterranean military base apparently abandoned by the government. And the chilling images he brought back could be described as “post-apocalyptic noir.”

In May 2016 the explorer, who goes by the online handle of “todtodson,” published the photos of his expedition on the image-sharing website imgur. But he is, technically, a trespasser as well as an artist. So wisely, he and his group have chosen to keep their identities hidden.

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