Sapaesan Tunnel: Seoul Ring Expressway

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Crazy engineering enabled long tunnel (~4km or ~2.5mile) thru big mountain…

옛날에 뉴스에 한참 오르고 내리던 사패산 터널: 정말 이렇게 펑펑 뚫어도 되나 몰러…

2017.8

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