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Abstract: Subsequent a quarry blast, at Franzefoss Pukk - section Vassfjell in May 2016, carbon monoxide gas migrated through a 40 m shaft, into a tunnel facility for aggregate production. A TV team from the Norwegian Broadcaster NRK together with employees in Franzefoss Pukk was present in the tunnel during the gas migration. The involved persons got various symptoms from the gas involving sickness,...