Understanding Submarine Cable Map and Dark Fiber Infrastructure for Global Connectivity
The internet around the world runs through physical cables placed under the ocean. These submarine cables carry more than 95% of global data between countries. According to Grand View Research, the submarine cable market reached USD 31.70 billion in 2024. This market keeps growing because more people need fast and stable internet. A submarine cable map shows where these cables connect countries and continents. Dark fiber works together with submarine cables to support strong network systems. Dark fiber means unused fiber optic cables that companies can rent or own for their own networks. Many businesses use a submarine cable map to see where cables land and plan their connections. Because of this, understanding how submarine cables and dark fiber work together helps companies choose the right internet setup. How deep are submarine cables buried? Submarine cables are buried at different depths based on where they are located. A submarine cable map typically shows the routes of these cables across the ocean floor. In shallow waters near the coast, crews bury cables 1 meter deep into the ocean floor. This protects them from ship anchors and fishing nets. According to KIS-ORCA, special underwater plows dig narrow trenches to bury the cables. However, deep ocean areas do not need cable burial. Instead, cables in deep water just sit on the ocean floor. This is because fewer ships and fishing boats go to those deep areas. Looking at any submarine cable map, you can see that cables crossing deep ocean trenches sit at depths over 8,000 feet below sea level. Meanwhile, companies use water jets and underwater robots to bury cables in areas up to 2,000 meters deep. What happens when undersea internet cables are cut? Damaged submarine cables quickly stop internet services. Countries lose their internet connection until workers fix the cables. A submarine cable map helps network operators see which cables are affected and plan alternate routes during outages. For example, Internet Society reported that in March 2024, four cables were damaged off the coast of West Africa. This affected many countries at the same time. Fixing broken cables needs special ships and trained workers. First, workers pull the broken cable from the ocean floor onto the repair ship. Then, they connect new cable pieces to fix the break. Most simple repairs take 5 to 15 days. However, harder repairs in dangerous areas can take many months. For instance, Recorded Future found that cable breaks in the Red Sea in February 2024 took almost five months to fix. This was because of permit delays and safety concerns in that region. Why do we need undersea cables with satellites available? There are many reasons why submarine cables are still very important today: Satellites are still useful in places where cables cannot reach. Remote islands and far areas often use satellites because it is hard to install cables there. But according to TeleGeography, satellites carry less than 0.37% of the world’s data. Most busy coastal areas use submarine cables instead. MarketsandMarkets also says the submarine cable market reached USD 18.2 billion in 2024. It is expected to grow to USD 29.7 billion by 2029. Big companies like Google and Meta continue to build new submarine cables. Today, there are 559 active submarine cable systems around the world. Building reliable network infrastructure Submarine cables are the main foundation of global internet connectivity. Businesses need reliable fiber infrastructure to send and receive their data. Dark fiber solutions give dedicated bandwidth without sharing with other users. This means companies can grow their network speed as they need more data capacity. Companies can check the submarine cable map to see how their location connects to global networks. ARNet provides dark fiber solutions that connect businesses to important network infrastructure. Our dark fiber services let companies control their own network capacity and speed. ARNet’s infrastructure links to major submarine cable landing stations and data centers across the region. We help businesses understand the submarine cable map and connect to the right landing points for their needs. If your business needs connections between countries in Southeast Asia using sea cables, ARNet can help. We help businesses understand the submarine cable map and connect to the right landing points for their needs. Choose ARNet because we offer dedicated fiber solutions with guaranteed bandwidth and low delay times. Our network infrastructure helps businesses that need secure and reliable internet for their work. ARNet’s dark fiber services remove the speed limits that shared networks create. This gives your company the performance needed for applications that use lots of data. About the Author Nabila Choirunnisa, Digital Marketing Executive at ARNet
7 Critical Steps to Deploy Dark Fiber Internet Cable Infrastructure Successfully
Global data use is growing very fast, and networks must carry more traffic every year. This way, making a strong infrastructure is now essential. Reports from the ITU say fixed broadband traffic could pass 6 zettabytes in 2024, up from 5.1 zettabytes in 2023. This growth is driven by mostly over fiber‑based internet cable that can handle high speeds and heavy workloads. At the same time, many operators want more control over that capacity. Thus, they are moving from renting bandwidth toward owning their own physical fiber infrastructure. This is why dark fiber is becoming a key choice for long‑term performance, flexibility, and cost efficiency. How to choose an internet cable? Choosing an internet cable should be based on distance, speed needs, environment, and future growth. For modern networks, fiber-optic cables are usually the best choice. This is because fiber optics carry most high-speed broadband traffic around the world. Millions of kilometers of new fiber are installed each year to support this demand. Single-mode fiber is usually used for long-distance routes. Meanwhile, multimode fiber is common inside buildings and data centers, where connections are shorter and need high port density. With this in mind, it is important to understand what to consider when choosing a cable. Key factors for selecting the right cable include: 7 Steps to deploy dark fiber internet cable Deploying dark fiber internet cable follows clear steps that connect business needs with network design and on-site work. As 5G, cloud services, and AI grow, networks must handle today’s traffic and much more in the future. By following the steps below, teams can move smoothly from planning to building and daily use. 1. Define demand and service objectives Start by listing who will use the network and what they need, such as data centers, mobile operators, or enterprise sites. Turn these needs into clear targets like capacity per route, maximum delay, and uptime goals, so the design reflects real demands. 2. Design the optical architecture Create a network layout that supports today’s traffic while allowing growth, choosing between ring, mesh, or point‑to‑point topologies. Decide how much internet cable capacity and how many fiber pairs are needed, so new services and higher speeds can be added later without rebuilding routes. 3. Select fiber and passive components Based on the design, choose single‑mode or multimode fiber and the right cable type, such as duct, aerial, or direct‑buried. Check that all components can support current speeds and likely future upgrades, so the physical layer remains useful for many years. 4. Secure permits and rights‑of‑way Work early with city authorities, utilities, and landowners to obtain permits and land access documents. Good preparation at this step reduces the risk of delays, fines, or route changes during construction. 5. Execute civil works with strict QA During construction, apply best practices for trenching, duct laying, and cable pulling to avoid damage. Use tests such as OTDR to confirm that signal loss and splice quality match the design, so the network works as expected once it goes live. 6. Integrate monitoring and operations After the network is active, connect the internet cable routes to a central monitoring system that can see alarms, breaks, and performance in real time. This visibility helps operators maintain strong service levels and deliver the high uptime that customers expect. 7. Plan for scalability and upgrades Reserve spare ducts and fiber pairs so new capacity can be added as traffic grows. This forward‑looking approach makes it easier to connect new data centers, support more 5G sites, and introduce faster optical technology without major new civil works. Conclusion The rapid rise in global data use makes dark fiber internet cable a smart long‑term choice for organizations that need control, speed, and room to grow. By clearly understanding both current and future needs, and then choosing the right fiber type and cable design, companies build a strong base that can support more users, more services, and higher speeds without constant rebuilds or costly changes to the physical network. For organizations that want support across this entire journey in Southeast Asia, ARNet offers an AI‑grade, all‑fiber internet cable network of more than 10,000 km across Thailand, Malaysia, Singapore, and Indonesia. ARNet owns and operates its infrastructure end‑to‑end, combining planning, deployment, and monitoring to deliver fast, stable, and scalable connectivity that fits data center, metro, and long‑haul needs. For more information, you can visit our website or reach out to our team. About the Author Nabila Choirunnisa, Digital Marketing Executive at ARNet