During the great age of exploration, European navigators searched the southern oceans for unknown lands. Among them was James Cook, who became the first to chart New Zealand’s coastline in detail. Yet despite the precision of his voyage, he missed one of the region’s most dramatic features – the hidden fjord of Milford Sound. Why? The answer lies in optical illusion, cautious seamanship, and a landscape designed to deceive even the most skilled explorers.
Milford Sound Cook Missed It Twice | Milford Sound Cook l’a raté deux fois | Milford Sound Cook verpasste es zweimal | Milford Sound Cook lo pasó por alto dos veces | Milford Sound Cook przeoczył to dwa razy | ミルフォードサウンド クックは2回見逃した | 밀포드사운드 쿡은 두 번 놓쳤다 | 米尔福德峡湾 库克错过了两次
Imagine sailing through unfamiliar waters, tasked with discovering lands no one from your world has ever seen. The coastline stretches endlessly ahead – sharp ridges rising steeply from the sea, blanketed in deep green forests, their flanks lost in mist. The mountains are beautiful, almost unreal, but there’s little comfort in beauty when danger may lie just below the surface. We keep our course at a safe distance. The coast is rocky, the sea restless, and the maps – if they exist – are vague at best. One submerged reef or a sudden gust of wind could end the voyage in a moment. So we watch from afar, searching for a bay or inlet that offers safe anchorage, somewhere we might land, chart, explore. What we don’t see – what none of us see – is the narrow gap in the cliffs we’ve just passed. Hidden in shadow, its entrance veiled by the overlapping ridges, it doesn’t look like a passage at all. But it is. Just beyond that curve, a deep fjord cuts nearly 14 kilometers inland – a vast, sheltered channel that no European has ever set eyes upon. We sail on, unaware. A discovery missed not by ignorance or incompetence, but by caution, distance, and the sheer trickery of the landscape. And I can’t help but wonder – had we turned in, had we looked more closely – what might we have found?
During the Age of Discovery – spanning roughly from the 15th to the 18th century – European powers – chiefly Portugal, Spain, the Netherlands, France and Great Britain – competed fiercely for access to new lands, trade routes and untapped wealth. Oceans, once seen as vast and perilous barriers, began to be viewed instead as highways leading to uncharted territories. It was in this context that expeditions turned their attention to the southern part of the globe – an area long believed to conceal a massive landmass balancing the known continents of the Northern Hemisphere. This hypothetical continent was referred to as Terra Australis Incognita – the unknown southern land.
In 1642, Dutch navigator Abel Tasman, sailing under the commission of the Dutch East India Company, set off from Indonesia on a voyage southeast in search of this fabled continent. During the journey, he became the first European to reach the coasts of what is now Tasmania, and shortly after, New Zealand. However, Tasman had no clear understanding of the scale or geographic nature of what he had found. He did not fully explore the islands – instead, he skirted part of the coastline and recorded an encounter with the indigenous Māori, which he perceived as hostile. This encounter discouraged further exploration and prompted a swift departure. He also did not give New Zealand its modern name – that came later, from Dutch cartographers.
Abel Tasman (1603–1659) was a Dutch seafarer and explorer working for the Dutch East India Company during the height of the Netherlands’ maritime expansion. He was the first European to reach the coasts of Tasmania, New Zealand and parts of the South Pacific – including Tonga and Fiji. Tasman’s voyages were driven largely by commercial and strategic goals rather than scientific inquiry. Though he charted important new territory, he rarely went ashore or engaged deeply with local populations. His cautious approach and limited interaction meant that his discoveries were often only partial – but they marked a turning point in European knowledge of the southern oceans.
More than a century later, in 1768, James Cook, a British naval officer and skilled cartographer, embarked on a new expedition to the southern seas. His mission was both scientific and strategic. The official objective was to observe the transit of Venus from the island of Tahiti – a rare astronomical event that would help scientists calculate the distance between the Earth and the Sun with greater precision. At the same time, Cook had secret orders to explore unknown territories in the South Pacific that might serve as future British colonies. Like the Dutch before them, the British hoped to discover a vast southern continent – possibly rich in resources or located in a strategically advantageous position relative to Asia.
James Cook (1728–1779) was a British naval officer, cartographer and explorer whose voyages redefined European understanding of the Pacific. Over three expeditions, he charted the coastlines of New Zealand, Australia and numerous Pacific islands with remarkable accuracy. Unlike many of his predecessors, Cook’s missions combined imperial ambition with scientific investigation – his ships carried astronomers, botanists and artists, and gathered detailed information about the lands and peoples they encountered. Though he ultimately died during a conflict in Hawaiʻi, Cook left behind an extraordinary legacy as a disciplined navigator and a central figure of the Enlightenment-era exploration.
James Cook was actually the second European to discover New Zealand after Abel Tasman. He was, however, the one who meticulously cartographed the New Zealand coastline. He also confirmed that New Zealand was not the big continent that was expected to be found in the Southern Hemisphere. He cartographed New Zealand’s 2,400-mile coastline during his first Pacific journey, spending five months, between October 1769 and March 1770, circumnavigating the New Zealand islands.
The two main islands of New Zealand, separated by Cook Strait and bordered to the west by the Tasman Sea – both named after European explorers whose Pacific voyages helped place this remote land on Western maps in the 17th and 18th centuries.
Cook approached New Zealand from the East after he finished a scientific mission of observing the Venus transit across the Sun from Tahiti, in the Pacific Ocean. First, he sailed around the North Island from the North and continued alongside the western coastline of the South Island, heading South. Further, he sailed alongside the East coastline of the South Island and left through a strait separating the two islands, which was later named after him as Cook Strait, heading later to Australia (that time called New Holland) through the waters of the Tasman Sea. The channel between the islands, which he discovered, was named after him as the James Cook strait. A couple of weeks earlier, he also found another strait between the South Island and another island (Stewart Island) located to its South. For military and other strategic reasons, he did not include it in the official maps he drew.
Although very precise in their work, Cook and his sailors missed the southwest entrance to the South Island through a fjord now known as Milford Sound – and they missed it twice.
Even if you are quite close to its entrance (from the Tasman Sea separating New Zealand from Australia), the high mountainsides of the fjord optically overlap, so you would not say that there is a water passage between the mountains that leads 15 km deep into the island. You can clearly see that optical distortion from the tourist ships that sail today alongside the Milford Sound there and back (compare photos below). Cook was afraid to sail too close to the coastline because the rocky shores were dangerous for his ship in unpredictable wind conditions. From away, it was hence impossible for his crew to spot the passage. The passage was, however, well known and used by the native Māori people, who had mastered its tidal patterns and coastal navigation long before European arrival. The first Western sailor who entered the Milford Sound was John Grono, a Welsh sealer, in the early 19th century.
The strait on approach from the Tasman Sea. You can see one mountain formation beyond another. The photo even got two-dimensional. In fact, between the first mountain and the second one, there is one of the Milford Sound narrow straits, but the actual entry into the Southern Island is behind a curve that turns left. From the sea, it seems to be just a bay. The sailors of the Cook expedition missed it several times as they were looking for a safe and practical entry point into the Southern Island approaching New Zealand from the West.
