Over 95% of international data and voice traffic now traverses nearly a million miles of underwater communication cables. These sophisticated conduits support everything from government communications and financial transactions to high-definition streaming and real-time video conferencing. Their evolution from the 1850 telegraph cables across the English Channel to modern fiber optic systems underscores the critical role they play in our interconnected global economy.
Big Tech, Big Cables
In the past decade, the surge of webscale players has dramatically reshaped the subsea cable landscape. According to Paul Gabla, Chief Sales Officer at Alcatel Submarine Networks—the leading subsea cable manufacturer and installer—the likes of Meta, Google, and Amazon now account for nearly half of the market. This transformation reflects a growing demand fueled by the development of artificial intelligence and the expansion of vast data center networks.
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For instance, Meta’s recently unveiled Project Waterworth will deploy a staggering 50,000 km (31,000 miles) of cable across five continents, marking it as the world’s most ambitious subsea cable initiative. Similarly, Amazon’s Fastnet project—designed to link Maryland’s eastern shore with County Cork, Ireland—boasts a capacity exceeding 320 terabits per second, a metric equated to streaming 12.5 million high-definition movies simultaneously.
Vulnerabilities And The Cost Of Interruption
Despite their importance, the infrastructure is not without its vulnerabilities. Accidental damage from fishing operations or ship anchors remains a persistent risk, while emerging incidents have raised concerns about potential sabotage. Erin Murphy, a Senior Fellow at the Center for Strategic and International Studies, explains that a single cable disruption could isolate entire countries from critical services such as banking, e-commerce, and essential communications. This was starkly illustrated in Tonga’s 2022 incident, when an underwater volcanic eruption severed its sole communication link.
More recently, cable cuts in the Red Sea impacted Microsoft’s Azure cloud services, revealing that even temporary disruptions can lead to increased latency and degraded performance for users across Asia and the Middle East.
Heightened Geopolitical Tensions And Regulatory Scrutiny
The strategic nature of subsea cables has not gone unnoticed by governments. In the United States, the Federal Communications Commission has tightened regulations for foreign firms involved in building these networks, explicitly citing concerns over potential security threats from nations like Russia and China. FCC Chair Brendan Carr has emphasized efforts to ensure that critical hardware remains uncompromised, banning equipment from companies such as Huawei and ZTE.
In parallel, congressional oversight has intensified. Recently, a group of House Republicans queried tech giants including Meta, Amazon, Google, and Microsoft regarding their associations with Chinese cable maintenance providers. These moves underscore the increasing intersection of national security and digital infrastructure amid growing U.S.-China tensions.
Looking Forward
Investment in new subsea cable projects is projected to soar, with estimates nearing $13 billion between 2025 and 2027—almost double the capital invested in the preceding period. As tech giants expand their global networks, the integrity and resilience of subsea cables remain paramount for sustained connectivity and economic stability.
In an era where digital communication serves as the backbone of commerce and personal interaction, a robust underwater cable network is not merely a technical necessity, but a strategic imperative for the modern world.
