A British nuclear-powered submarine, HMS Superb, hit an underwater rock in the northern Red Sea, the Ministry of Defence said Wednesday, reported dpa.
No crew members were hurt in the incident and the submarine remains watertight, according to a ministry spokesman.
The submarine's sonar equipment was damaged in the incident, which occurred on Monday, forcing it to surface.
However, the submarine's nuclear reactor was "completely unaffected," according to the spokesman.
A full investigation was under way to determine the cause of the collision.
The vessel had passed through the Suez Canal and was in the northern Red Sea, 80 miles south of Suez, when she hit an underwater rock.
There were 112 crew on board, but no other vessel was involved.
The vessel is currently in international waters, but is unable to dive because of the damage to its sonar equipment.