Early in 2011, "Corner Brook" took part in Operation Caribbe, before transiting to the west coast as part of her redeployment to Esquimalt, British Columbia. On 4 June 2011 the submarine ran aground in Nootka Sound during manoeuvres off Vancouver Island. The submarine collided with the sea floor in of water while travelling at a speed of . The collision opened a hole in the submarine's bow. Two submariners were slightly injured. After the grounding incident civilian and military submariners began pre-maintenance work on the submarine, in the expectation of an extended maintenance program. At the time, the process, length and cost of the work was unknown due to existing contracts. A board of inquiry formed after the collision found that the cause of the collision had been human error. In February 2012, post-collision photos of the dry-docked submarine were published, showing extensive damage to the bow; the media also cited unofficial sources, saying the pressure hull may be damaged beyond repair.