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 "Japanese ironclad Kōtetsu"): Built in Bordeaux, France in 1864 for the Confederate States Navy as CSS "Stonewall", and acquired from the United States in February 1869, she was an ironclad ram warship.
Relevant evidence: No