US nuclear submarine in collision with cruiser

A United States Navy nuclear powered submarine collided with a cruiser during training exercises off the east coast of the USA on Saturday 13 October 2012.
The USS Montpelier, a Los Angeles-class attack submarine, collided with the Aegis guided missile cruiser USS San Jacinto whilst the submarine was at periscope depth.  The collision resulted in damage to the cruiser's sonar dome, located beneath the waterline on the bows of the ship.
The US navy said that no one was injured and that the submarine's nuclear propulsion plant was unaffected by the collision.  Both vessels were able to return to port under their own power, with the Montpelier arriving at the Kings Bay submarine base in Georgia the day after the collision.
An investigation will inquire into the cause of the collision and determine the responsibility for any fault, and a separate safety investigation board has been set up to identify hazards and the causal factors for the collision.