HMS Cook (K638): The Frigate That Finally Finished Captain Cook's Job

Born a Loch, Launched as a Bay

Every ship has an origin story, but few change their minds about what they want to be quite as often as HMS Cook. She began life on the drawing board in 1943 as a Loch-class frigate, one of dozens of anti-submarine escorts ordered under the Royal Navy's War Emergency Programme to hunt U-boats in the Atlantic.

She was even given a name for the role: Loch Mochrum, after a loch in Dumfries and Galloway that most of her future crew would never see.

By the time William Pickersgill & Sons of Southwick, Sunderland laid her keel on 30 November 1944, the Navy had rather more Atlantic escorts than it needed and rather too few anti-aircraft ships to protect the fleet then fighting its way towards Japan, where kamikaze attacks were making air defence the more pressing problem.

So, part-built and already renamed, she was redrawn as a Bay-class frigate, one of the 26 vessels created by taking the reliable Loch-class hull, machinery and lattice mast and bolting on a heavier anti-aircraft armament: twin 4-inch guns fore and aft, twin 40mm Bofors amidships, twin 20mm Oerlikons, and a Type 285 radar to help her gunners actually hit something.

She kept her Hedgehog and depth charges too, in case anything crept up from below.

She slid down the slipway on 24 September 1945 under yet another name, Pegwell Bay, after the Kentish inlet where, tradition rather generously insists, the Anglo-Saxons first landed. It was a fine name for a ship with no war left to fight: Germany had surrendered in May, Japan in August.

Built to defend a Pacific fleet from air attack, she arrived a few weeks too late to defend anyone from anything, which is as good a definition of wartime shipbuilding's unfortunate timing as any.

A New Name and a New Job

With the fighting over, half-finished warships across Britain's yards were quietly reconsidered, and Pegwell Bay was one of the ships whose fitting-out took its time.

When she was finally completed, it was not as a frigate at all but as a survey ship, and she was given a name to suit: HMS Cook, after Captain James Cook, the Yorkshireman who had spent the 1760s and 1770s charting more of the Pacific Ocean than anyone before him.

It was a neat piece of naming for a ship built in the same corner of north-east England Cook himself hailed from, Pickersgill's yard on the Wear at Sunderland some thirty miles up the coast from Marton, the Middlesbrough village where Cook was born; not quite within sight of her namesake's birthplace, whatever the more romantic version of the story likes to claim, but close enough in spirit for a ship about to spend her career finishing his unfinished business.

HMS Cook commissioned on 6 June 1950 and set about the unglamorous but essential business of hydrographic survey: measuring depths, currents and hazards, and turning the results into charts that keep other people's ships off the rocks.

Her early years were spent closer to home, surveying Scottish waters, before a 1953 deployment to the Gold Coast in West Africa, then still a British colony and soon to become independent Ghana.

That same year she took her place among the vast assembly of warships at Spithead for the Coronation Fleet Review, when Queen Elizabeth II inspected a Royal Navy still large enough to make quite a spectacle of itself.

In 1955 she was fitted out for trials of the Decca Navigator system, an early radio-based positioning system that let surveyors fix their position with a precision earlier generations of hydrographers could only have dreamed of, and which made her subsequent Pacific work considerably more accurate.

Following in Cook's Wake

From 1957, HMS Cook finally went to work in the ocean her namesake had made his own. There is something quietly satisfying about a ship named for the great cartographer of the Pacific spending her career finishing what he started, filling in and correcting charts in waters he himself had once sailed with rather less sophisticated instruments than a Type 285 radar and a Decca receiver.

Her first major task there was less about cartography than physics, and it began badly. She cleared Plymouth breakwater on 19 March 1957 bound for the Pacific by way of the Azores, the West Indies and the Panama Canal, only to run straight into a Channel gale so fierce it tore a brand-new Land Rover clean off its lashings on the forecastle and wrecked several of her boats and life rafts before she had even properly begun the voyage.

She arrived in time regardless, joining the rest of the fleet off Malden Island for a dress rehearsal before taking her place to observe Operation Grapple, Britain's first test of a thermonuclear weapon, on 15 May 1957: a hydrogen bomb dropped from a Valiant bomber over Malden Island, some four hundred miles south of the task force base at Christmas Island, her crew standing by on the forecastle in anti-flash gear as it went off. Survey ships like Cook played a supporting role in such operations, helping chart the test area and monitor conditions, a job that placed her, however briefly, at the edge of one of the more sobering chapters of the nuclear age.

What her crew were actually watching is worth setting down, because it took thirty-six years for anybody to be told. The weapon, a device called Short Granite, was dropped by a Valiant from forty-five thousand feet at twenty-two minutes to eleven in the morning and burst about eight thousand feet above the island. It had been designed to yield a megaton. It yielded something in the order of three hundred kilotons, roughly a quarter of what was wanted, and it was not, in the sense the scientists meant, a proper thermonuclear detonation at all. The government announced to the world that Britain had become the third thermonuclear power, which was the point of the exercise, and the shortfall stayed classified until 1993.

The men standing on Cook's forecastle in anti-flash gear are part of a longer story too. Something like twenty-two thousand British servicemen took part in the nuclear tests of the 1950s and 1960s, a great many of them national servicemen doing their two years, and they spent the rest of their lives arguing with successive governments about what a morning like that one had done to them. It took until November 2022, seventy years after the first British test, for a Nuclear Test Medal to be instituted. Anyone who was on that forecastle on 15 May 1957 is entitled to it, along with the civilians and the Australian, New Zealand, Fijian and Gilbertese personnel who were also there. Rather a lot of them did not live to collect it.

The years that followed were spent on rather more traditional survey work: charting the Solomon Islands, New Britain in the Bismarck Archipelago, the Philippines, and the Gilbert and Ellice Islands (now Kiribati and Tuvalu). None of it made headlines.

Her 1958 survey of the Solomon Islands was the first the Royal Navy had conducted since HMS Pinguin in 1895 and HMS Sealark in 1907, and it showed: at Mono in the Treasury Islands, her surveyors found the island itself sitting four and a half miles from where the chart said it ought to be, the kind of discrepancy that explained rather a lot about why this work still mattered.

All of it mattered, since many of the charts she was updating dated back to nineteenth-century surveys, in some cases to Cook's own contemporaries, and merchant and naval shipping alike depended on getting the depths right.

Aground Off Suva

Survey work is precise, careful, patient work, right up until the moment it isn't. At 1737 on 1 October 1963, while seeking an anchorage near Vatu-Ra, HMS Cook struck a coral head and was badly holed forward; she was refloated ten hours later, and temporary repairs at Suva required stripping out some 1,300 tons of equipment before divers from the New Zealand frigate HMNZS Taranaki could properly assess the damage.

No lives were lost, and two of her crew, Chief Shipwright J.F. Norris and Leading Seaman D.J. Wilkinson, were later commended for their part in the emergency response. Her commanding officer, Commander F.W. Hunt, MBE, faced a Board of Enquiry at Suva that October and was subsequently court-martialled in Singapore on 10 and 11 January 1964, where he was found guilty of both hazarding and stranding his ship, the standard charges levelled whenever a vessel finds the seabed in a manner not intended by her navigator.

It is worth noting that a court martial for hazarding a ship is the Navy's routine mechanism for establishing what went wrong after any grounding, not necessarily a verdict on recklessness; either way, it was an undignified note on which to end a decade and a half of careful chart-making.

Patched up sufficiently to make the voyage, Cook returned to the United Kingdom by way of the Indian Ocean and the Suez Canal, a long way home for a ship that had spent so much of her career mapping some of the remotest corners of the Pacific.

Into Reserve, and Out of the Record

HMS Cook was decommissioned on 1 May 1964 and placed into reserve, where she sat, destored and unwanted, for four years before finally being sold to the British Iron and Steel Corporation for demolition; she was towed to Zeebrugge in April 1968 to be broken up, a rather more mundane end than her more famous namesake ever met.

What can be said with confidence is that her active career was over: fourteen years spent almost entirely in the unglamorous, unheralded work of making the sea safer for everyone who sailed after her.

Of her 25 completed Bay-class sisters, most served as conventional frigates, two became despatch vessels, and four, Cook among them, were converted to survey duties; several others went on to serve foreign navies, with four transferred to Portugal and one to Finland.

Cook's own path, from a loch that never was to a bay that briefly was to a name that suited her best of all, is as good an illustration as any of how a class of wartime emergency escorts could find a second, quieter purpose once the war they were built for had already ended.

She may have missed the fighting entirely, but in spending a decade and a half charting the Pacific, HMS Cook did rather more to honour the memory of Captain James Cook than a few years of gunnery ever could have.