On 26 October 1850, British naval officer Robert McClure made a historic discovery in the Canadian Arctic when he sighted the long-sought Northwest Passage from Banks Island towards Melville Island.
The moment marked a major breakthrough in centuries of exploration, confirming a geographical connection between waterways previously explored from opposite sides of North America.
Although the Northwest Passage discovery did not immediately make the route navigable, it helped establish the existence of a sea passage linking the Atlantic and Pacific oceans through the Arctic archipelago.
The centuries-long search for an Arctic route
For hundreds of years, European explorers had searched for a northern sea route connecting the Atlantic and Pacific oceans. Such a passage promised a potentially shorter trading route between Europe and Asia, avoiding the long voyages around Africa or South America.
However, the Arctic presented enormous obstacles. Thick sea ice, extreme cold, unpredictable weather and poorly charted coastlines repeatedly frustrated attempts to find a navigable route.
By the mid-19th century, expeditions had mapped parts of the Canadian Arctic, but the connections between its waterways remained uncertain.
The disappearance of Sir John Franklin’s expedition, which departed in 1845 to explore the Northwest Passage, prompted a major international search and brought renewed attention to the region.
Robert McClure’s expedition aboard HMS Investigator
In 1850, McClure commanded HMS Investigator on a British expedition sent to search for Franklin and his missing crews.
Unlike many earlier expeditions that approached the Arctic from the Atlantic, McClure entered from the Pacific, travelling through the Bering Strait and along the northern coast of North America.
His ship eventually reached the Prince of Wales Strait, which separates Banks Island from Victoria Island in what is now Canada’s Northwest Territories.
As winter approached, HMS Investigator became trapped in the ice, preventing the crew from continuing north by sea.
McClure therefore organised an overland reconnaissance expedition to determine whether the strait connected with waters already explored by earlier British navigators.
The discovery on 26 October 1850
On 26 October, McClure and his companions reached a vantage point on Banks Island from which they could look towards Melville Island and the frozen waters of Melville Sound.
They recognised that the waterway ahead connected with the region reached by explorer William Edward Parry during his Arctic voyage of 1819–1820.
This established that a continuous geographical route existed through the Arctic islands, providing the missing link between explorations approaching from the Pacific and Atlantic.
For McClure, it was the confirmation that generations of explorers had sought.
Yet the discovery came with an important limitation: the passage was obstructed by ice, and HMS Investigator could not sail through it.
Trapped in the Arctic and rescued years later
McClure’s difficulties continued after the discovery. In 1851, HMS Investigator attempted another route around Banks Island but became trapped again, this time in Mercy Bay.
The ship remained icebound as supplies dwindled and crew members suffered from malnutrition and scurvy.
In April 1853, a rescue party from HMS Resolute reached the stranded expedition. McClure’s crew eventually abandoned Investigator and travelled over the ice to join the rescuers.
The men returned to Britain in 1854, having completed a journey across the Northwest Passage by a combination of ship travel and overland movement rather than sailing continuously through it.
McClure was subsequently knighted, and the expedition received official recognition for its achievement.
Why the discovery remains significant
McClure’s achievement represented a turning point in the geographical understanding of the Canadian Arctic, although historical evidence indicates that Franklin’s expedition had encountered another passage several years earlier.
Finding a geographical connection was also different from completing a continuous voyage through the passage by ship. The first successful ship transit is generally credited to Norwegian explorer Roald Amundsen, whose expedition completed the journey between 1903 and 1906.
Today, the Northwest Passage remains significant to Arctic navigation, scientific research and discussions about the effects of changing sea ice conditions.
More than 175 years after McClure looked out across the frozen waters towards Melville Island, his expedition remains an important chapter in the history of polar exploration.
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