The Deadly Mystery of Buco di Viso
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PEOPLE DIED IN THIS TUNNEL. And medieval builders had no idea why. In 1478,
workers began digging one of Europe’s first Alpine tunnels — Buco di Viso, carved straight
through solid rock between France and Italy. Men went inside every day.
Some never came back. There were no collapses. No visible injuries. Just workers stumbling
out dizzy… or not coming out at all. Officials blamed “bad air.” But fear spread
fast. Workers refused to enter. Priests were brought in to bless the
tunnel. Tools were left behind. Torches abandoned. For months,
the project nearly died underground. Modern science says it was carbon dioxide pockets — invisible,
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