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The wreck of the USS Monitor was designated the first national marine sanctuary in 1975. The sanctuary, which lies 16 miles off of Cape Hatteras, N.C., includes a column of water one nautical mile in diameter that extends down 240 feet to the seabed around the wreck. The first-of-its-kind assessment of the sanctuary’s archaeological and living marine resources serves as a baseline for monitoring changes to the wreck and sanctuary.