HMS Ursula (S42): A Second Life as HMCS Corner Brook

The Build: Birkenhead

HMS Ursula was built by Cammell Laird at Birkenhead, her keel laid on 10 January 1989, launched on 28 February 1991 and commissioned into the Royal Navy on 8 May 1992, an Upholder-class diesel-electric submarine, the fourth and last of her class to be built.

The Upholders were meant to be the answer to a straightforward question: what replaces the Oberons when they wear out? They were quieter, more heavily automated and needed a crew of around forty-five rather than sixty-eight, and on paper they were among the best conventional submarines anybody had built. Ursula was the fourth and last of them down the ways at Birkenhead, and by the time she commissioned in May 1992 the question the class had been built to answer had stopped being asked.

The name had been carried before by a boat that made rather more of her opportunity. HMS Ursula (N59) fired the first British torpedoes of the Second World War, which is the kind of entry in a name's history that a submarine decommissioned after two and a half years was never going to match.

A Short Royal Navy Career

Like her sister boats, Ursula's time in Royal Navy service was cut short by the sweeping post-Cold War defence reviews that judged the entire Upholder class surplus to requirements almost as soon as it had entered the fleet. She was decommissioned on 16 October 1994, having served for barely two and a half years.

It was an expensive way to discover that the Cold War had ended. Four boats had been built and a further eight cancelled, and the Royal Navy chose to give up conventional submarines altogether and run an all-nuclear force instead. HMS Unseen had already gone into reserve that April and HMS Unicorn, the last vessel Cammell Laird would build for seventeen years, followed. Between them the four boats had managed less than a decade of Royal Navy service.

Sold to Canada

The British government offered Ursula and her three sister submarines to Canada in 1993, an offer accepted in 1998 under a lease arrangement worth US$427 million plus a further US$98 million for upgrades, with provision for an eventual symbolic sale after eight years.

Canada had come to that offer by a long and slightly humiliating road. Her 1987 defence white paper had proposed spending eight billion dollars on ten to twelve nuclear attack submarines, chiefly so that Canada could actually patrol under her own Arctic ice rather than take other people's word for what was happening beneath it. The plan died in May 1989, killed by the budget and by the fact that the threat it was aimed at was visibly coming apart; by then most Canadians polled thought a Soviet attack unlikely and did not want to pay for it. That left three worn-out Oberons and no successor, and when Britain put four nearly new conventional boats on the market at a fraction of what building anything would cost, the arithmetic made itself.

The four became the Victoria class, delivered across 2000 to 2004, and the lease was always structured to end in Canadian ownership for a nominal sum rather than a real one. The transfer did not go smoothly. The last of them to cross, the original lead boat Upholder, renamed HMCS Chicoutimi, sailed from Britain in October 2004 and the following day, on the surface in a gale, took water in through the conning tower. The resulting electrical fire killed one of her officers. It coloured Canadian opinion of the whole purchase for years afterwards, and it is fair to say the class has never entirely shaken the reputation it acquired in those first few years.

Reactivation was delayed by welding issues discovered during the refit process, but Ursula was finally handed over to the Canadian Forces on 21 February 2003.

A New Name

She was commissioned into the Royal Canadian Navy as HMCS Corner Brook on 29 June 2003, taking her name from the Newfoundland city, and has continued to serve under that identity ever since, a submarine that has now spent considerably longer flying the Canadian maple leaf than she ever spent under the White Ensign.

Fourteen Years Alongside

Her Canadian service has been anything but steady. On 4 June 2011, while manoeuvring submerged during a submarine officer training exercise off Nootka Sound on the west coast of Vancouver Island, Corner Brook hit the bottom. The impact crushed the fibreglass dome covering her bow sonar array and did structural damage forward. Nobody was killed, which given that she was dived and under way at the time was a considerable piece of luck, but she was finished as an operational boat for a very long time. With her out of action Canada was briefly left without a single submarine available for service.

She went into an Extended Docking Work Period in 2014 that was meant to finish in 2017. It did not. The scope grew from repairing the bow into structural work, deep maintenance, equipment replacement and a full life-extension, and then two further accidents in dock pushed it out again: a fire aboard on 1 April 2019 while she sat in dry dock at Esquimalt, and in March 2020 a ballast tank test in which compressed air was admitted too quickly, overpressurising the tank and rupturing it. The grounding damage itself cost something like twenty million Canadian dollars to put right. The whole programme wrapped around it came to roughly six hundred and ninety-five million.

She went back to sea on 13 February 2025, for the first time in nearly fourteen years, and the Royal Canadian Navy declared her ready for operations that April after sea trials and work-up, with the Indo-Pacific named as where she would be going. Then, on 12 July 2026, north of Kauai during the RIMPAC exercise, she fired a Mk 48 heavyweight torpedo that delivered the final blow to the decommissioned American cruiser USS Mobile Bay in a sinking exercise.

It is worth sitting with that for a moment. A submarine laid down at Birkenhead in 1989 for a Cold War that ended before she commissioned, discarded by her own navy after thirty months, sold abroad, wrecked on a Canadian seabed and left in pieces in a dock for fourteen years, put a torpedo into a nine-thousand-ton cruiser in the Pacific in the summer of 2026. She has now been Canadian for more than twenty-three years against two and a half British ones, and whatever else can be said about the decision to sell her, she has outlasted the reasoning behind it by a comfortable margin.

Her replacement is finally in sight, and the timing is almost comic. On 6 July 2026, six days before Corner Brook put that torpedo into the Mobile Bay, the Canadian government named the German yard TKMS as preferred supplier for the Canadian Patrol Submarine Project, a programme for up to twelve new boats and the largest defence procurement in Canadian history. Contracts are meant to be signed by the end of 2027 and the first four boats delivered in 2034, ahead of the Victorias retiring in the second half of the 2030s. So the boat Britain built for a war that ended before she commissioned, and gave up on after thirty months, has a fair chance of completing forty years of service before anybody relieves her.