The USS Missouri grounding occurred 17 January 1950 when the battleship USS Missouri (BB-63) ran aground while sailing out of Chesapeake Bay. No one was injured, but the battleship remained stuck for over two weeks before being freed from the sand. The ship was so damaged that she had to return to port and enter dry dock for repairs.
There was a similar incident in the 1960s, when the Royal Navy’s last battleship, HMS Vanguard, was being towed out of Portsmouth Harbour, where she had been mothballed for years, to be broken up. Just as she was passing through the narrow harbour mouth, she broke free of her tugs and buried herself in the mud completely blocking the channel. As a result much of the Royal Navy’s Home Fleet was immobilised for several days.