MARCH 19TH, 1865: The USS Massachusetts struck a torpedo in Charleston Harbor; "fortunately it did not explode." The incident took place two days after the Coast Survey steamer Bibb had been damaged by a torpedo in the harbor and occurred within 50 yards of the wreck of the monitor USS Patapsco, which had been sunk by a torpedo two months earlier on January 15th.
The danger to those attempting to clear torpedoes from the waters previously controlled by the South was constant, as was the risk to ships that were simply operating in the waters.
Not an Easy Duty. --Old B-R'er