The biggest permafrost ice tunnels in the world Posted by lukestateson on Monday February 10, 2020 @09:50PM from the siberiantimes.com dept. http://siberiantimes.com/other/others/features/inside-the-amazing-permafrost-ice-tunnels-built-by-exiled-german-genius-in-cold-war/ ( no comments | 2 points | on HN )
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