On 16 August 1858, a message from Queen Victoria to United States President James Buchanan crawled across the floor of the North Atlantic at a rate of roughly one word every ten minutes. The greeting ran to 98 words. It took about 16 hours to transmit. Slow by any standard today, and yet astonishing: only weeks earlier the same message would have travelled by mail steamer and taken around ten days to cross from Ireland to Newfoundland. For the first time in history, the two sides of the Atlantic could exchange words faster than a ship could sail.
The cable that carried those words was the work of an obsessive American financier, Cyrus West Field, and a consortium of British and American engineers led by the chief engineer Charles Tilston Bright. They had spent four years and two failed attempts trying to bridge the ocean with copper wire wrapped in gutta-percha, a Malaysian tree resin that hardened into a natural insulator underwater. When it finally worked, on the third attempt, church bells rang in New York and cannons were fired in Boston. And then, three weeks later, the line went silent.
A cable made of copper, tar, and hope
Field’s first serious try came in the summer of 1857. Two converted warships set out from Ireland paying cable behind them, and about 380 miles into the crossing the line snapped and vanished into water two miles deep. The expedition turned back. The following June the ships tried a different plan, meeting in the middle of the ocean to splice their two halves and steam apart. The splice broke three times before it finally held at the beginning of August 1858.
The 1858 cable was about 4,000 kilometres long and weighed close to a ton per nautical mile. Its core was seven strands of copper wire, coated in three layers of gutta-percha, wound with tarred hemp, and then armoured with 18 spiralled strands of iron wire. Two ships — HMS Agamemnon and USS Niagara — met at a rendezvous point in mid-Atlantic, spliced their halves together, and steamed in opposite directions toward Valentia Island in Ireland and Trinity Bay in Newfoundland. A contemporaneous dispatch from Cyrus Field, reprinted in Scientific American in August 1858, put the route at about 1,700 nautical miles and reported that for more than two-thirds of it the seabed lay over two miles down. No one had ever paid this much cable into water this deep, and after earlier breaks — the first blamed on paying-out gear that gripped the line too hard — the engineers were still guessing at the tension it could bear.
The raw material alone was a small ecological event. Gutta-percha, the gum of a Southeast Asian tree, was the only insulator known to survive immersion in seawater, and the project consumed close to the entire world supply. A single 2,500-mile length of cable swallowed hundreds of tons of it, and the demand stripped forests across Borneo, where the trees were felled rather than tapped. A century and a half later the substance has almost no everyday use left except in dentistry.
The physics were poorly understood. Wildman Whitehouse, the chief electrician and a former surgeon with no formal training in electrical theory, believed higher voltages would push signals through faster. He applied as much as 2,000 volts to the line. What he did not grasp — but what the Scottish physicist William Thomson, later Lord Kelvin, had already warned about — was that a long submarine cable behaves like an enormous capacitor. Each pulse smears out over time, and hitting it with high voltage does not sharpen the signal. It burns the insulation. Within weeks the gutta-percha had broken down and the cable fell silent.
Three weeks that changed the ocean
Only 732 messages passed through the 1858 line before it died, and yet the effect was seismic. Reception was so faint that operators leaned on Thomson’s mirror galvanometer, a new instrument sensitive enough to read a current as a spot of light trembling on a scale. Even with it, a single character could take two minutes to arrive. The Associated Press used the line to move commercial news that had previously been days stale.
That galvanometer still exists. The instrument on which Queen Victoria’s greeting was read out in Newfoundland is now held by The Henry Ford museum, its face inscribed with a note that nearly all the messages sent through the Atlantic cable in August and September 1858 were received on it. It is one of the few physical survivors of a connection that lasted less than a month.
The most famous message the cable carried was an act of thrift. Two British regiments stationed in Canada had been ordered onward for redeployment to India, where troops were being gathered to suppress the Indian Rebellion. By the time the order was in motion, the rebellion had already been put down. The British government cabled the countermand instead of sending it by ship, holding the regiments where they were. According to IEEE Spectrum’s history of the cable, the saving was put at £50,000 to £60,000 — enough to recoup roughly a seventh of the British share of the project with a single order.
The cultural shock ran deeper than the accounting. Newspapers on both sides of the Atlantic printed euphoric editorials about the annihilation of space and time. Sermons framed the cable as a divine instrument of peace. Souvenir hunters bought short lengths of leftover cable, mounted on brass, as mantelpiece ornaments; the New York jeweller Charles Tiffany bought up the surplus and sold thousands of them. Then the line went quiet, and public opinion swung hard the other way. Some accused Field of running a hoax or a stock scheme. A committee of inquiry was convened in London.
The pattern that stuck
What the 1858 cable proved, even in failing, was that the idea was not impossible. It also handed the industry a set of hard lessons that every later cable would follow. Insulation had to be thicker and tested at every stage. Signalling had to be gentle: Thomson’s sensitive galvanometer replaced Whitehouse’s brute-force approach and became standard. Cable ships needed precise mechanical brakes to control the tension as the line ran out over the stern.
The blame settled quickly. Whitehouse was dismissed and became the scapegoat for the failure, while Thomson’s cautious approach was vindicated; he was knighted for his work on the cable. The next serious attempt waited until 1865, after the American Civil War. By then the only vessel large enough to carry the full length of an improved cable was the Great Eastern, the largest ship in the world, designed by Isambard Kingdom Brunel — who had died in 1859, years before his ship ever touched a cable drum. Operated now by the Telegraph Construction and Maintenance Company, the Great Eastern set out in July 1865 and had laid most of the route when the cable snapped and disappeared into the Atlantic.
The gap the cable was meant to close was still painfully real. When Abraham Lincoln was assassinated in April 1865, the news took about twelve days to reach British newspapers, carried the only way it could be — by ship.
The following year the Great Eastern returned and finished the job. On 27 July 1866 it reached Heart’s Content, Newfoundland, with a working line behind it, its first messages carrying news of the peace treaty that had just ended the war between Prussia and Austria. A few weeks later the crew grappled up the broken 1865 cable from the seabed, spliced on a fresh length, and completed a second working route. The IET’s archive of the 1865–1866 expeditions records how the ship recovered a cable end from the deep and turned one success into two.
The new line was transformative in a way the numbers make plain. The 1858 cable had managed about a tenth of a word per minute. The 1866 cable ran at roughly eight words a minute, some eighty times faster, though messages still cost around a pound a word and the line could carry only one at a time. PBS’s American Experience notes that even the working 1866 cable handled only about 50 messages on a busy day, far below its theoretical capacity.
From that point the ocean floor began to fill with copper. By 1900 there were fifteen cables across the Atlantic. By 1940, telephone conversations were crossing them. In 1956, TAT-1 carried the first transatlantic voice calls on a coaxial cable. In 1988, TAT-8 became the first fibre-optic cable across the Atlantic, carrying roughly 40,000 simultaneous phone calls on threads of glass thinner than a human hair.
The cables in service today are direct descendants of the 1858 line in ways that are easy to miss. They still follow roughly the same great-circle routes between Ireland, Cornwall, Newfoundland and the American northeast. They still consist of a signal core, insulation, and armoured outer layers. They are still laid by specialised ships paying out cable over a stern sheave, using tensioning logic worked out in the 1860s.
Why the ocean, still
It is tempting to assume the internet lives in the sky, on satellites and in data centres. It does not. When someone in London opens a website hosted in Virginia, the request almost certainly travels down a fibre-optic cable that lands on a beach in Cornwall, dives to the seabed, and surfaces again on the Atlantic coast of North America. These cables carry, according to TeleGeography’s submarine cable research, the overwhelming majority of all intercontinental data — email, video calls, banking transactions, the software updates that keep phones alive. Satellites handle a fraction of a percent.
The TeleGeography submarine cable map shows hundreds of active cables at present, with new ones commissioned every year by consortia of telecom operators and, increasingly, by Google, Meta, Microsoft and Amazon, who now own or co-own a large share of transoceanic capacity.
These cables fail more often than most people realise. Ships’ anchors drag them, fishing trawlers snag them, undersea landslides sever them, and repair vessels criss-cross the oceans to grapple them up and splice them back together, using techniques that would be recognisable to Field’s crews in 1866. Roughly two hundred faults happen every year, most of them caused by anchors and fishing gear. For readers curious about the software half of that journey, the piece on how a browser resolves a web address traces the request from a phone to a distant server.
Cyrus Field died in 1892, largely forgotten and, after a series of bad investments, nearly bankrupt. The cable he pushed into the Atlantic worked for three weeks. But the pattern it set — a fragile filament laid along the seabed, connecting two continents at something close to the speed of light, vulnerable to a single fishing trawler and yet indispensable to modern life — is the pattern the internet still runs on today.
