In a striking display of naval prowess, Canada's HMCS Corner Brook submarine recently sank a decommissioned U. S. warship, the guided-missile cruiser USS Mobile Bay, during the Rim of the Pacific (RIMPAC) exercises off Hawaii. The successful torpedo strike occurred on July 12, 2026, and was the decisive blow that sent the vessel to the ocean floor. This event signifies a notable return for Canada's submarine force to RIMPAC, marking its first participation in the world's largest naval exercise in 12 years.
The sinking exercise (SINKEX) was part of a larger, month-long RIMPAC war game involving over two dozen countries and thousands of military personnel. The USS Mobile Bay was sunk in deep waters off Kauai's northern coast, approximately 4,570 metres deep. The exercise tested Canada's ability to generate a complete submarine engagement chain, from detection to weapon launch, after a significant period of repairs and upgrades for HMCS Corner Brook. The submarine had been out of operational service for 14 years following a grounding incident in 2011 and subsequent extensive refits.
Canadian task force commander Capt. Landon Creasy stated that such live-fire targeting exercises are invaluable for submariners, allowing them to demonstrate their skills and showcase their contributions to Canada's defence program. U. S. Navy Vice Admiral Jeff Jablon echoed the sentiment, highlighting the sinking exercise as a prime example of the strength and readiness shared among the participating nations. The successful engagement by HMCS Corner Brook underscores the capability of Canada's Victoria-class submarines and their importance in international defence collaborations.
