A garden hose is typically about two to three centimeters in diameter. Surprisingly, the submarine cables that carry most of the internet traffic between continents are about the same size. These cables contain fiber-optic strands, which are finer than a human hair, encased in layers of protective materials like steel, plastic, and pressure-resistant gel. While the core fiber is less than 3 millimeters in diameter, the entire cable can be as thick as a garden hose—about ten centimeters in diameter—once all the protective layers are added. These cables are essential for global communication, carrying nearly all of a country's digital traffic across the ocean floor. As these cables approach the coast, they are buried to prevent damage from ships. In deeper waters, they lie exposed on the seabed, protected by layers of steel wires arranged in a structure called a Warrington arch. This design helps the cable withstand high pressure and twisting forces. Additionally, a copper coating provides power to repeaters—devices that amplify the signal over long distances. These repeaters, which are bullet-shaped and weigh up to 400 kilograms, are placed every few dozen kilometers to ensure the signal remains strong enough to be read. Despite their importance, these cables are not immune to damage. Most faults are accidental, caused by commercial fishing activities and ship anchors, especially in shallow coastal waters where fishing nets and anchors are common. According to the International Cable Protection Committee, 70 to 80% of cable breaks are due to human activity, while the rest are caused by natural events like underwater earthquakes or landslides. Repairs are challenging, particularly in deep waters, where some repairs have taken over 947 days to complete. When a fault is detected, operators send a light pulse through the cable to pinpoint the break's location with high precision. A specialized cable ship then travels to the site, where it retrieves the damaged section, repairs it on the ship's deck, and re-lays the cable on the seabed. These repairs can take up to twenty days and require highly skilled technicians working under a microscope to reconnect the delicate fiber strands. Despite the challenges, the global network of submarine cables has grown significantly, with the total length increasing from about one million kilometers in 2014 to around 1.7 million kilometers in 2025. However, the number of faults remains relatively low—about 150 to 200 per year—highlighting the reliability of this critical infrastructure.