Statistics for occurrence #1 of “Lieutenant Bolton” in chapter 45 of Admiral David D. Porter, The Naval History of the Civil War.:

...cess of blasting rocks by powder, superposed upon the rock with a deep column of water over it, we are of the opinion that the depth of water below a torpedo would not interfere with its success. Lieutenant Bolton , who saw and blasted a great deal in East River, near New York, says: One hundred pounds of powder, fifteen feet from the bottom of a vessel, would break her sides or bottom. We would add that a...
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