{"id":129,"date":"2026-08-19T09:02:43","date_gmt":"2026-08-19T06:02:43","guid":{"rendered":"https:\/\/soakjam.com\/knowledge\/?p=129"},"modified":"2026-08-23T00:09:43","modified_gmt":"2026-08-22T21:09:43","slug":"how-the-internet-crosses-oceans","status":"publish","type":"post","link":"https:\/\/soakjam.com\/knowledge\/how-the-internet-crosses-oceans\/","title":{"rendered":"How the Internet Crosses Oceans: Inside the Cables Beneath the Sea"},"content":{"rendered":"\n
To understand how the internet crosses oceans, look beneath the sea rather than toward the sky. Send a message across the world and it can arrive almost instantly. Join an international video call and voices, faces and shared files move between continents with barely noticeable delay. It is easy to imagine that this information travels mainly through satellites. In reality, the physical backbone of international communication is much closer to the bottom of the ocean.<\/p>\n\n\n\n
Fiber-optic submarine cables carry approximately 99% of international data traffic. They support everyday browsing as well as cloud services, financial transactions, government communications and global business. More than 500 active and planned submarine cable systems were estimated worldwide as of 2024, according to the International Telecommunication Union (ITU).<\/p>\n\n\n\n
These cables are not a separate internet. They are critical links inside the same worldwide network of routers, data centers, terrestrial fiber and local internet providers that connects your device to online services.<\/p>\n\n\n\n
\n
Quick answer:<\/strong> When information must cross an ocean, internet providers usually route it through a fiber-optic cable on or beneath the seafloor. Lasers carry encoded data through glass fibers, optical amplifiers strengthen the signal along long routes, and landing stations connect the cable to networks on land.<\/p>\n<\/blockquote>\n\n\n\n
How the internet crosses oceans, step by step<\/h2>\n\n\n\n
The exact route of an internet request changes according to your location, provider, network conditions and the service you are using. A simplified journey looks like this:<\/p>\n\n\n\n
\n
Your device creates data packets.<\/strong> A message, search request or video stream is divided into small units called packets.<\/li>\n\n\n\n
Your local connection carries the packets to an internet provider.<\/strong> This first part may use Wi-Fi, mobile radio, copper cable or fiber.<\/li>\n\n\n\n
Routers choose a path through regional and international networks.<\/strong> The packets can pass between several independently operated networks.<\/li>\n\n\n\n
A terrestrial fiber route reaches a cable landing station.<\/strong> This secure coastal facility connects land-based networks with a submarine cable system.<\/li>\n\n\n\n
The submarine cable carries the signal across the sea.<\/strong> On a long route, repeaters inside the system amplify the optical signal at regular intervals.<\/li>\n\n\n\n
Another landing station receives the signal.<\/strong> From there, terrestrial networks carry the packets toward the destination data center or user.<\/li>\n<\/ol>\n\n\n\n
The return data does not always follow exactly the same route. Internet routing systems can select different paths according to agreements between networks, available capacity and outages.<\/p>\n\n\n\n
An ocean crossing is also not required every time you open an international website. Content delivery networks store copies of popular files closer to users. A page belonging to a company on another continent may therefore load from a nearby data center, reducing delay and international traffic.<\/p>\n\n\n\n
What is inside a submarine internet cable?<\/h2>\n\n\n\n
At the center of a modern telecommunications cable are very thin strands of glass called optical fibers. They are normally organised into fiber pairs and surrounded by several protective and functional layers. The exact construction changes with the cable system and the environment in which it will be installed, but it can include:<\/p>\n\n\n\n
\n
Optical fibers<\/strong> that carry information as light<\/li>\n\n\n\n
Protective compounds and tubes<\/strong> that cushion the fibers and keep out water<\/li>\n\n\n\n
Steel strength members<\/strong> that help the cable withstand tension during installation and recovery<\/li>\n\n\n\n
A copper conductor<\/strong> that supplies electrical power from shore to submerged equipment such as repeaters<\/li>\n\n\n\n
Polyethylene insulation<\/strong> that protects the internal components from seawater<\/li>\n\n\n\n
Additional steel armour<\/strong> in areas where anchors, fishing equipment or rough seabed conditions create greater risk<\/li>\n<\/ul>\n\n\n\nA submarine telecommunications cable protects its optical fibers with layers designed for strength, power delivery and resistance to seawater.<\/figcaption><\/figure>\n\n\n\n
Deep-ocean cable can be surprisingly slim because it faces little human activity on the seafloor. Cable used near coasts is often thicker and more heavily armoured. Where conditions permit, installers may also bury it below the seabed for additional protection.<\/p>\n\n\n\n
The cable is engineered not only to survive water and pressure, but also to support its own weight while being lowered into or recovered from water that can be several kilometres deep.<\/p>\n\n\n\n
How does glass carry so much information?<\/h2>\n\n\n\n
Equipment at a landing station converts digital information into optical signals. Lasers send those signals through the transparent core of the fiber. The light is guided along the glass by the physics of reflection, allowing it to travel far with relatively low loss.<\/p>\n\n\n\n
Modern systems do more than switch a single beam on and off. They use advanced modulation to encode information and wavelength-division multiplexing to carry multiple optical channels\u2014different colours, or wavelengths, of light\u2014through the same fiber. This is one reason a cable containing a limited number of fibers can carry enormous amounts of data at the same time.<\/p>\n\n\n\n
Even high-quality optical fiber gradually weakens and distorts a signal. Long-distance systems therefore include watertight repeaters containing optical amplifiers. Depending on the design, repeaters are commonly separated by roughly 50 to 120 kilometres. Electrical power for these submerged amplifiers is supplied from equipment at the cable landing stations.<\/p>\n\n\n\n
Light travels more slowly through glass than through a vacuum, but it is still extremely fast. Google has reported a speed of about 204,190 kilometres per second for light in its subsea fiber. Distance, routing and network equipment add delay, which is why a nearby server usually responds faster than one on the other side of an ocean.<\/p>\n\n\n\n
How is a route planned and installed?<\/h2>\n\n\n\n
A new submarine cable is a multinational infrastructure project, not simply a long wire placed between two beaches. The complete process can take more than two years.<\/p>\n\n\n\n
First, planners identify where more capacity or a more diverse route is needed. They arrange financing, landing rights, environmental studies and permits in every relevant jurisdiction. Engineers then survey the seabed to study water depth, slopes, sediment, earthquake risk, fishing activity, anchoring areas and existing cables or pipelines.<\/p>\n\n\n\n
The route is designed to reduce risk while keeping the cable length practical. After the cable and its repeaters are manufactured and tested, they are coiled into large tanks aboard a specialised cable-laying ship.<\/p>\n\n\n\n
During installation, the ship follows the planned path while carefully paying out cable behind it. In the deep ocean, the cable is generally laid directly on the seabed. In shallower or busier waters, it may be armoured and buried with a plough or remotely operated vehicle. The final shore section enters a landing point and connects to the equipment inside the cable station.<\/p>\n\n\n\n
Accurate records of the installed position are important. They help other seabed users avoid the cable and allow repair teams to recover it later if a fault occurs.<\/p>\n\n\n\n
Why use cables instead of satellites?<\/h2>\n\n\n\n
Satellites remain essential. They connect ships, aircraft and remote communities, distribute broadcasts, support navigation and provide communication where terrestrial infrastructure is unavailable. Low-Earth-orbit satellite systems have also reduced the delay associated with older geostationary services.<\/p>\n\n\n\n
For the bulk movement of data between major population and computing centres, however, fiber-optic cables offer extremely high capacity and an efficient cost per transmitted bit. Their routes are also much shorter than a radio signal travelling from Earth to a distant satellite and back.<\/p>\n\n\n\n
This is not a competition in which one technology must replace the other. Cables, satellites, terrestrial fiber, mobile networks and local Wi-Fi perform different parts of global connectivity. Submarine cables carry most intercontinental data; satellites extend coverage and provide important alternative capabilities.<\/p>\n\n\n\n
What causes submarine cable faults?<\/h2>\n\n\n\n
Submarine cables are reliable, but they are not indestructible. The ITU reported more than 170 cable repairs worldwide in 2025\u2014nearly four per week on average. That number may sound alarming, yet most users never notice because large networks are designed with alternative routes.<\/p>\n\n\n\n
Accidental human activity is the leading source of damage. The International Cable Protection Committee (ICPC) estimates that commercial fishing and ship anchors cause about 70\u201380% of faults. Other causes include equipment failure, abrasion, earthquakes, underwater landslides, volcanic activity and powerful sediment flows.<\/p>\n\n\n\n
Risk is not distributed equally. A deep-ocean cable may remain undisturbed for years, while cables on continental shelves and near busy ports face more contact with fishing gear and anchors. Burial, armour, nautical charts, route planning and communication with maritime industries all help reduce these risks.<\/p>\n\n\n\n
How is a broken cable repaired?<\/h2>\n\n\n\n
Monitoring equipment can detect a fault and help engineers estimate its location. The cable operator then mobilises a specialised repair ship carrying compatible spare cable and jointing equipment.<\/p>\n\n\n\n
At sea, the crew locates the cable and may use a remotely operated vehicle or a grapnel to recover it. The damaged section is cut out, and the sound ends are brought aboard. Technicians splice in a new length, seal the joints inside protective housings and test the repaired connection. The ship then lowers the cable back to the seabed and may arrange for the repaired section to be buried where conditions allow.<\/p>\n\n\n\nSpecialist vessels locate a damaged cable, recover it from the seabed, splice in a replacement section and lower it back into position.<\/figcaption><\/figure>\n\n\n\n
The physical jointing work is only one part of the delay. A repair can also depend on travel distance, weather, water depth, permits, ship availability and the time required to load the correct spare cable. Some repairs therefore take days, while others take weeks.<\/p>\n\n\n\n
Why does one broken cable rarely stop the internet?<\/h2>\n\n\n\n
Major networks try to avoid relying on a single route. If one cable fails, routing systems can move traffic to other cables with available capacity. Users may see no interruption, although congestion can increase and connections may become slower because the alternative route is longer or busier.<\/p>\n\n\n\n
Redundancy is strongest where many independently routed cables connect the same regions. Islands and countries served by only one or two systems are more exposed: a fault can have a much larger local impact. For this reason, resilience depends not only on adding capacity but also on creating geographically diverse landing points and routes.<\/p>\n\n\n\n
The future of the network beneath the sea<\/h2>\n\n\n\n
Engineers continue to increase capacity by adding fiber pairs, improving optical transmission and using technologies such as space-division multiplexing and wavelength-selective switching. These advances allow a cable system to carry more information and distribute capacity more flexibly between landing points.<\/p>\n\n\n\n
Submarine fibers may also help scientists observe the ocean. Researchers are studying optical sensing and \u201cSMART\u201d cables that combine telecommunications with sensors for temperature, pressure and seismic activity. Such systems could contribute to earthquake, tsunami and climate monitoring, although the main purpose of commercial submarine cables remains reliable communication.<\/p>\n\n\n\n
The cables themselves may be hidden, but the need to protect them is increasingly visible. Governments, cable operators, manufacturers and maritime industries must coordinate route planning, permits, repairs and risk information to keep this shared infrastructure resilient.<\/p>\n\n\n\n
The main idea<\/h2>\n\n\n\n
The global internet may feel wireless, but its longest and most important connections are physical. Beneath the oceans, glass fibers carry light between continents. Landing stations connect those fibers to networks on land; repeaters keep the signals strong; cable ships install and repair the routes; and network operators redirect traffic when something goes wrong.<\/p>\n\n\n\n
The next time a message crosses the world in a fraction of a second, part of its journey may be taking place in darkness, thousands of metres below the surface of the sea.<\/p>\n\n\n\n
Frequently asked questions<\/h2>\n\n\n\n
Are all submarine internet cables buried?<\/h3>\n\n\n\n
No. Cables are commonly buried or heavily protected in shallower areas where fishing and anchoring create greater risk. In much of the deep ocean, they are laid directly on the seabed.<\/p>\n\n\n\n
Can one cable carry data in both directions?<\/h3>\n\n\n\n
Yes. Cable systems contain fiber pairs and transmission equipment designed to carry large volumes of data between connected landing points in both directions.<\/p>\n\n\n\n
Do satellites carry most international internet traffic?<\/h3>\n\n\n\n
No. Satellites are important for coverage and specialised services, but submarine fiber-optic cables carry approximately 99% of international data traffic.<\/p>\n\n\n\n
How long does a submarine cable last?<\/h3>\n\n\n\n
The design life varies, but modern systems are commonly planned to operate for more than 20 years. They may be retired earlier if capacity needs, economics or network designs change.<\/p>\n\n\n\n
Does every international website visit cross an ocean?<\/h3>\n\n\n\n
No. Content delivery networks and regional data centers may store a nearby copy of the content. Whether your request crosses an ocean depends on where the requested data is available and how networks route it.<\/p>\n\n\n\n
Satellites may seem like the obvious way to connect continents, but most international internet data travels through fiber-optic cables on the seafloor. Here is how those cables are built, laid, powered, protected and repaired.<\/p>\n","protected":false},"author":1,"featured_media":144,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[90,17],"tags":[77,80,78,76,79],"class_list":["post-129","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-computing-technology","category-science-technology","tag-fiber-optics","tag-global-networks","tag-internet-infrastructure","tag-submarine-cables","tag-telecommunications"],"yoast_head":"\n
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