Six point three kilometers of limestone cut vertically, walls that rise up to 52 meters above the water, and a width at the waterline of only 24.60 meters. This is what Greece delivered in 1893, after a titanic project launched eleven years earlier. The canal measures 6,343 meters in length and 24.60 meters in width, with a trench that reaches a maximum height of 52 meters for a depth of 8 meters. An engineering feat, no doubt. A canal carved for the maritime future, but much less capable.
Key takeaways
- An age-old dream finally realized: how Periander of Corinth, Nero, and later engineers all failed before 1893
- The unstable walls and the narrow gauge quickly turn the maritime shortcut into a geological trap
- From a commercial disaster to tourist triumph: how an obsolete canal found a spectacular second life
A dream two and a half millennia old
The idea of piercing the Isthmus of Corinth did not originate in the 19th century. The notion of a Corinth Canal goes back to Periander of Corinth in the 7th century BCE, but discouraged by the sheer scale of the project, he opted instead to develop the Diolkos, a dragging path to move ships. This paved route, along which boats were literally rolled from one gulf to the other on wheeled carts, sufficed for centuries.
The emperor Nero, for his part, wanted something grander. Construction of a canal truly began under the Roman emperor Nero in 67 AD, using Jewish prisoners captured during the First Jewish–Roman War. He launched an initial attempt in 67, employing 6,000 Jewish prisoners, but it was abandoned barely a year later, after his death. It would take another eighteen centuries for the project to seriously resume, in the form of plans drawn up by European engineers fascinated by this strategic bottleneck linking the Ionian Sea to the Aegean Sea.
A construction that transformed a peninsula into an island
Modern works began in 1882, under the direction of Hungarian engineer István Türr and with French capital. The initial schedule called for five years of work. The reality proved far harsher: the difficulties caused investors to doubt, the company could no longer raise funds on the Paris stock exchange, and it went bankrupt in July 1889, while work halted with 8.2 million cubic meters already excavated, but 2.2 million remained to be removed. The Greek financier Andreas Syngrós then took up the task. He formed a new Greek company that resumed construction in 1890, with Béla Gerster still directing the works, up to the solemn inauguration on July 25, 1893 in the presence of King George I.
The result of this extraordinary project? The canal’s excavation turned the Peloponnese into an island. The first ship, Notre-Dame-du-Salut, crossed the passage a few months later. A French ship measuring 110 meters in length and 13 meters in width traversed the canal in January 1894. Thirteen meters wide for a canal offering twenty-four: the margin initially seemed comfortable. It would quickly prove illusory.
The reversal: a canal too narrow for the ships it was meant to serve
The economic calculation of the time projected heavy traffic. The canal was designed to attract nearly 4 million net tonnes of traffic per year, but only about 500,000 net tonnes passed in 1906. Traffic reached 1.5 million net tonnes in 1913 before falling sharply during World War I, and its economic role remained limited due to the canal’s narrowness, difficult navigation, landslides, and the growing size of commercial ships in the 20th century.
The paradox is there, almost cruel: at the very moment the work was completed, global mercantile shipping embarked on a race toward gigantism. Freighters and tankers grew throughout the 20th century, while the canal itself remained fixed in its 1893 dimensions. Although it saves about 700 kilometers of travel around the Peloponnese, the canal is too narrow for today’s ocean-going vessels, able to accommodate only ships with a maximum width of 17.6 meters and a draft of 7.3 meters. In reality, it is only 21.4 meters wide at its base, meaning many modern ships simply cannot pass today.
Added to these draft limitations is a geological fragility that has never disappeared. Although the canal formally opened in July 1893, landslides delayed navigation until November, and the works to stabilize the walls led to a total closure of four years between 1893 and 1940. In 1923, around 41,000 cubic meters of rock collapsed into the channel, requiring two years to clear. The canal, literally squeezed between its own unstable walls, never lived up to the traffic promises for which it had been dug.
A tourism giant, a freight pygmy
Today, the structure lives a second life, far from its original ambition. The canal is now primarily used by tourist ships, with about 11,000 vessels passing along the route each year. More recent estimates place the figure at as high as 15,000 annual passages, largely yachts, sailing boats, and small cruising craft. The passage remains a spectacular moment for mariners, wedged between cliffs that are nearly vertical and induce vertigo.
Geological incidents, meanwhile, continue to punctuate the canal’s life. Heavy rains prompted a temporary closure in February 2018, a major landslide closed the canal in early 2021, then it reopened temporarily from June to October 2022 before reopening again on June 1, 2023 after additional safety measures. A sign that the canal’s dimensions can still accommodate large vessels under exceptional conditions: on October 9, 2019, the cruise ship MS Braemar became the longest and widest vessel ever to transit the canal. A punctual, precisely guided feat that more than anything confirms the prevailing rule rather than refuting it.
Expanding the canal to bring it up to today’s maritime standards? The idea was studied and then dismissed: the cost of such a project, carried out in limestone rock widely regarded as unstable, would far exceed the anticipated benefits of a commercial traffic that had become marginal. The Corinth Canal will thus remain what it has become by force of circumstance: a shortcut for small boats and a spectacular vertigo-inducing backdrop for tourists, rather than the maritime highway its builders imagined two and a half millennia earlier.
Sources: structurae.net | histoire.bnpparibas
