Owen Stanley, Library and Archiv
They never returned.
The Inuit, native residents of the North, tell tales of the three-masted ships caught in ice and of men afflicted by scurvy and going hungry, until finally they broke the biggest taboo of humankind: cannibalism.
LIBRARY & ARCHIVES CANADA
It was not until 2014 that the first traces of the expedition emerged, when divers located a shipwreck that they identified as HMS Erebus, named after the spiritual limbo between Earth and hell.
Last month, the second big piece of the mystery fell into place when an Inuit ranger and a team of explorers announced that they had located HMS Terror - in near-pristine condition, not far from the Erebus - at the bottom of the Northwest Passage.
The Washington Post
The story of the ships' loss and eventual finding reveals how much the Arctic, and our relationship with this frontier, has changed in just a few decades.
The ice is no longer what it once was; scientists think that the Arctic will be reliably ice-free and navigable in the summer by the middle of the century, if not earlier.
The admiralty asked John Franklin, a 59-year-old polar explorer, to find a northern sea path linking the Atlantic and Pacific oceans.
Europeans thought of the world as perfect and symmetrical, according to Franklin's Lost Ship, a book by John Geiger and Alanna Mitchell.
Explorers had discovered a passage at the bottom of South America that linked the Atlantic and the Pacific. And so people reasoned that a similar one must exist in the north.
He filled his hold with three years' worth of canned food in case the voyage took longer than the expected two years.
On May 19, 1845, Erebus and Terror, both painted a menacing black with a yellow stripe, set off down the River Thames and into the Atlantic Ocean. Londoners thronged the banks and cheered the might of their empire.
But Franklin was heading into a frontier that science had not mastered.
Compasses did not work properly because their magnetic readings were impaired by proximity to the North Pole. There were no weather reports. It was much colder than today, and there were years with no summer ice melt at all, said Ryan Harris, an underwater archaeologist at Parks Canada.
Ships can quickly get trapped in cement-like ice.
TRAPPED BY ICE
The expedition entered the Arctic Ocean before the end of May and picked through the labyrinth of the Canadian Arctic archipelago.
Franklin and his men reached as far north as 77 degrees, about 1368km from the North Pole, before wintering on a tiny uninhabited island.
The landscape there is flat and desolate, with storms bringing 100kmh icy winds from the North Pole.
There is almost no wildlife, and the only flora are stubborn Arctic mosses that cling to black rocks littering the frozen ground. The region is vast; even today, only 10 per cent of the Canadian Arctic has been mapped.
The only way to survive is by listening to the Inuit, said Adrian Schimnowski, chief executive of the Arctic Research Foundation, who spends five months every year in the North.
"When the Inuit give you advice on weather, hunting grounds, the best route to take to get somewhere, I follow 100 per cent what they say," he said.
"They know the land better than anyone else."
Inuit oral history suggests that Franklin and his men, however, did not consult with them.
In September 1846, the British made a fateful decision to sail through a dangerous channel, the Victoria Strait. The strait is only 321km from the Canadian mainland, and yet it routinely experiences heavier ice conditions than areas farther north, Zagon said.
Zagon thinks a storm crept up on the expedition, icing Victoria Strait within hours and trapping the ships.
The men huddled onboard for nearly two years, waiting for the ice to clear. But even in summer, it remained unyielding, said Edward Carmack an emeritus oceanographer with the Institute of Ocean Sciences in British Columbia.
Two dozen men, including Franklin, died of illness.
The remaining men abandoned the ships on April 22, 1848, in a mad effort to walk south, across King William Island, to the Canadian mainland.
It was a dangerous plan; in biting winds, it took them three days just to trek across the 24km of ice to the island. We know this because five years later, a note written by Erebus' commander was found under a stone landmark on King William Island.
Search parties dispatched from Britain did not find the ships or any survivors, but the Inuit told them of having seen men starving, their faces blackened possibly by scurvy.
The survivors ate their comrades after boiling body parts in their boots, the Inuit said.
The oral history seemed to be confirmed in 2014 when scientists examined human remains from King William Island and found hack marks apparently left on skeletal remains by desperate butchers.
Franklin's ships had been considered lost to history. But in the 2000s, as the summer sea ice began to clear because of global warming, nations jostled to access the Arctic's riches.
In 2008, Canada began searching for the Erebus and the Terror as one way to prove a centuries-long link to the North.
"Franklin's ships are an important part of Canadian history given that his expeditions laid the foundations of Canada's Arctic sovereignty," Stephen Harper, who was then Canada's prime minister, said in 2014.
A coalition of Canadian government agencies and the Arctic Research Foundation, a nonprofit backed by BlackBerry founder and Ontario native Jim Balsillie, began sweeping the Northwest Passages for Franklin's ships using sonar.
In 2014, the Erebus showed up on the sonar. When divers examined it, they found a nearly intact ship.
Off to one side was a massive bell, cast in 1845 to honour the expedition.
On the lower decks are intact chests where the men had stored their personal effects, said Harris of Parks Canada.
Underwater archaeologists are carefully recovering artifacts.
A second breakthrough came in September, when Sammy Kogvik, an Inuit ranger who lives in Gjoa Haven, the only settlement on King William Island, boarded an Arctic Research Foundation vessel, where he told Schimnowski an odd story: Seven winters ago, he and a friend had been snowmobiling off King William Island, on the secluded and frozen Terror Bay, when they saw a pole sticking out of the ice.
They went closer and saw that it was a six-foot-tall wooden mast.
Kogvik wrapped his arms and legs around it and hung off it while his friend snapped a photo. But Kogvik lost the camera during the trip and never told anyone about the incident, although he had thought of Franklin's doomed expedition.
Schimnowski immediately set course for Terror Bay, which was ice-free this past summer.
His team used a side-scan sonar, which images the ocean floor, to peer through the turbid waters. Just as they were about to give up, they passed right over an ancient three-masted ship at the bottom of the ocean, 130km north of the Erebus.
Divers examined the ship a week later and confirmed that it is the Terror.
The ship is tightly sealed and probably contains documents and other artifacts in pristine condition.
"All in all, it makes for a rather dramatic visual to see this steely ship lying at rest on the sea floor," Harris said.
Scientists say it is doubtful that the Erebus and the Terror would have been found if they had been hidden under the ice common during Franklin's time or even the ice found in the 1970s and 1980s.
Until recently, Victoria Strait thawed only once every 10 years, but now it usually clears every summer, Zagon said. Instruments such as a side-scan sonar are best used in open water.
Over the next few years, Parks Canada scientists will study the ships, photograph them and excavate the site to learn as much as they can about the expedition's fate.
They will look for bodies, and perhaps even the coffin of Franklin.
They will recover artifacts, documents, charts and other materials to answer old questions and new ones: Why is the Terror so far north of the Erebus? Did the men sail her there? And why did so many men fall ill so rapidly? Why did they decide on a treacherous trek that claimed their lives?
"These were trained men, and they didn't just sit on the boat and starve to death," Carmack said. "They looked for ways out. What was the trail of death, and what will we uncover to complete the story of that survival epic?"