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18 August 2024

Safeguarding Subsea Cables: Protecting Cyber Infrastructure amid Great Power Competition

Daniel F. Runde, Erin L. Murphy, and Thomas Bryja

Subsea fiber-optic cables, a critical information and telecommunications technology (ICT) infrastructure carrying more than 95 percent of international data, are becoming a highly consequential theater of great power competition between the United States, China, and other state actors such as Russia. The roughly 600 cables planned or currently operational worldwide, spanning approximately 1.2 million kilometers, are the world’s information superhighways and provide the high-bandwidth connections necessary to support the rise of cloud computing and integrated 5G networks, transmitting everything from streaming videos and financial transactions to diplomatic communications and essential intelligence. The demand for data center computing and storage resources is also expected to increase in the wake of the artificial intelligence revolution. Training large language models takes enormous, distributed storage to compute, and if those networks are globally oriented, they will require additional subsea capacity to connect them. These geopolitical and technological stakes necessitate a consideration of the vulnerabilities of subsea systems and the steps the United States can take to fortify the digital rails of the future and safeguard this critical infrastructure.
Undersea Cables: Why Do They Matter?

Subsea cables are critical for nearly all aspects of commerce and business connectivity. For example, one major international bank moves an average of $3.9 trillion through these cable systems every workday. Cables are the backbone of global telecommunications and the internet, given that user data (e.g., e-mail, cloud drives, and application data) are often stored in data centers around the world. This infrastructure effectively facilitates daily personal use of the internet and broader societal functions. In addition, sensitive government communications also rely extensively on subsea infrastructure. While these communications are encrypted, they still pass through commercial internet lines as data traverses subsea infrastructure. Subsea cables carry a much larger bandwidth and are more efficient, cost-effective, and reliable than satellites; consequently, they have been credited with increasing access to high-speed internet worldwide, fueling economic growth, boosting employment, enabling innovation, and lowering barriers to trade. These networks are now indispensable links for the modern world and are pivotal to global development and digital inclusivity.

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