Question: What is the water depth of sanctuary which is the site of the wreck of the first ironclad warship commissioned by the union navy?
Sentence (from "USS Monitor"): "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.
Relevant evidence: No