What is the water depth of sanctuary which is the site of the wreck of the first ironclad warship commissioned by the union navy?
230 ft
Title: USS Monitor
Passage: USS "Monitor" was an iron-hulled steamship.  Built during the American Civil War, she was the first ironclad warship commissioned by the Union Navy.  "Monitor" is most famous for her central role in the Battle of Hampton Roads on 9 March 1862, where, under the command of Lieutenant John Worden, she fought the casemate ironclad  (built on the hull of the former steam frigate USS "Merrimack" ) to a standstill.  The unique design of the ship, distinguished by its revolving turret which was designed by American inventor Theodore Timby, was quickly duplicated and established the monitor type of warship.
Title: Monitor National Marine Sanctuary
Passage: Monitor National Marine Sanctuary is the site of the wreck of the USS "Monitor", one of the most famous shipwrecks in U.S. history.  It was designated as the country's first national marine sanctuary on January 30, 1975, and is one of only two of the thirteen national marine sanctuaries created to protect a cultural resource rather than a natural resource.  The sanctuary comprises a column of water 1 nmi in diameter extending from the ocean’s surface to the seabed around the wreck of the Civil War ironclad, which lies 16 nmi south-southeast of Cape Hatteras, North Carolina.  Average water depth in the sanctuary is 230 ft .  Since its sinking in 1862, the "Monitor" has become an artificial reef attracting numerous fish species, including amberjack, black seabass, oyster toadfish and great barracuda.
Title: SMS Hansa (1872)
Passage: SMS "Hansa"  was a German ironclad warship built in 1868–1875.  She was the first ironclad built in Germany; all previous German ironclads had been built in foreign shipyards.  She was named after the Hanseatic League, known in Germany simply as "Hanse", Latinized "Hansa".  The ship was launched in October 1872 and commissioned into the German Imperial Navy ("Kaiserliche Marine") in May 1875.  Designed for overseas service, "Hansa" was classed as an armored corvette and armed with eight 21 cm guns in a central battery.
Monitor National Marine Sanctuary USS Monitor