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Big Thunder

May 6, 1977: “Big Thunderbolt” is one of five civil defense sirens being installed around Mandan this week. In an audio test Friday morning two sounds, a warble for enemy attack and a steady blast for natural disasters will be heard.  (Bismarck Tribune Archives)

May 6, 1977: “Big Thunderbolt” is one of five civil defense sirens being installed around Mandan this week. In an audio test Friday morning two sounds, a warble for enemy attack and a steady blast for natural disasters will be heard. (Bismarck Tribune Archives)