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#concretetunnel #cave #morningwide #sbswide #taebaektunnel #mystery #abandonedmine #shelter #suspicious #Mystery #WonderofKorea #culvert #emergencywaterway #minedam #sulfate #soilandwaterpollution A mysterious tunnel in Taebaek, Gangwon-do. As I pushed through the bushes and entered, I was able to find a hidden entrance. As I continued to enter the space that I thought was a small artificial tunnel, at some point it turned into a rock cave?! The artificial tunnel and the rock cave continue to be half and half. The secrets of the 400m long cave with an unknown purpose are revealed on 'Sbswide'. SBS 'Morning Wide Part 3' 'Mr. Reboot' (broadcast on 2024.06.28)