A U.S. Navy submarine and an Aegis cruiser collided off the East Coast on Oct. 13, the Navy reported.
No one was reported injured in the mishap, and both ships continued to operate under their own power.
Operating submerged, the submarine Montpelier was apparently rising to periscope depth, a Navy spokesman said, when it was struck by the cruiser San Jacinto about 3:30 p.m. Eastern time.
The submarine’s nuclear power plant was unaffected, the Navy said in a statement, but the San Jacinto received damage to its large sonar dome, located at the base of the ship’s bow.
Overall damage to both ships is still being evaluated, the Navy said.
The ships were conducting exercises in the Jacksonville operating area off the northeast Florida coast, the spokesman said.
Both ships are homeported at Norfolk, Va.
The incident is under investigation, the Navy said.