The bottom of the ocean could become a battlefield
Beneath the world's oceans runs an invisible architecture of civilization — fiber-optic cables carrying 99 percent of global data and $10 trillion in daily transactions, as fragile as they are foundational. Former intelligence officials now warn that China and Russia have quietly shifted the balance of power in this hidden domain, investing far more in severing these threads than the West has in protecting them. As Trump prepares to meet Xi in Beijing, the seabed itself has become a theater of strategic competition, where a single coordinated strike could unravel not just markets and communications, but the political will of nations.
- China has already demonstrated the capability to cut undersea cables deliberately, with Taiwan reporting roughly 30 subsea incidents in recent years and Beijing testing a deep-sea device engineered to slice through armored cables at 3,500 meters.
- The real danger is not just economic devastation — a coordinated attack could simultaneously cripple the internet, banking systems, energy markets, and military communications, creating the kind of domestic chaos that erodes public resolve.
- U.S. adversaries are devoting substantially more resources to attacking this infrastructure than the West is to defending it, an asymmetry that former Pentagon officials describe as a glaring and underacknowledged vulnerability.
- Bipartisan legislation — the Strategic Subsea Cables Act of 2026 — has been introduced in the Senate, signaling that Washington is beginning to reckon with the scale of exposure, even as experts caution that most cable breaks remain accidents.
- With Trump and Xi set to meet in Beijing, the cables carrying the data of those very negotiations lie exposed on the ocean floor — fragile connective tissue between two powers in deepening strategic rivalry.
Beneath the ocean floor runs the nervous system of modern civilization — fiber-optic cables spanning thousands of miles of seabed, carrying 99 percent of the world's data and underpinning roughly $10 trillion in financial transactions every day. According to Andrew Badger, a former Pentagon official now at defense technology firm Coalition Systems, these cables are sitting ducks.
Badger has spent years studying what he calls the asymmetric vulnerability at the heart of American economic power. China and Russia, he argues, have identified a weakness the United States has been slow to defend — both nations devoting far more resources to attacking undersea infrastructure than the West spends protecting it. The threat is not theoretical: Taiwan has reported roughly 30 subsea cable incidents in recent years, and in April, China's Ministry of Natural Resources announced a successful deep-sea test of a device engineered to slice through armored submarine cables at 3,500 meters. Suspicious disruptions have also surfaced in European waters, suggesting a pattern of gray-zone operations designed to probe Western responses without crossing the threshold of declared war.
Badger frames this as hybrid warfare in its purest form. A severed cable can be blamed on a dragging anchor. A coordinated strike, however, could simultaneously disrupt the internet, banking systems, energy markets, and military communications. But he argues the deepest damage would be political — the fracturing of public confidence and the paralysis of decision-making. Beijing, he suggests, might target American cable infrastructure not to win a military battle, but to break American resolve on Taiwan, an island that also controls much of the world's most advanced semiconductor manufacturing.
The urgency has begun to register in Washington. Senators John Barrasso and Jeanne Shaheen introduced the bipartisan Strategic Subsea Cables Act of 2026 in April, aimed at strengthening the resilience of this critical infrastructure. Experts like Anniki Mikelsaar of the Oxford Internet Institute urge caution — between 150 and 200 cable breaks occur globally each year, most of them accidents — but the structural vulnerability remains. As Trump prepares to meet Xi in Beijing for talks on trade, AI, and Taiwan, the cables carrying the data of those negotiations lie exposed on the ocean floor, fragile threads connecting two great powers in an era of deepening competition.
Beneath the ocean floor runs the nervous system of modern civilization. Thin strands of fiber-optic cable, laid across thousands of miles of seabed, carry 99 percent of the world's data and underpin roughly $10 trillion in financial transactions every single day. They connect continents, enable commerce, power militaries. And according to a former Pentagon official, they are sitting ducks.
Andrew Badger, now chief strategy officer at Coalition Systems, a defense technology firm, has spent years studying what he calls the asymmetric vulnerability at the heart of American economic power. China and Russia, he argues, have identified a weakness that the United States has been slow to recognize, let alone defend. Both nations are devoting substantially more resources to attacking undersea infrastructure than the West is to protecting it. The imbalance is stark, and the stakes are enormous.
The threat is not theoretical. Taiwan, the self-governing island at the center of escalating U.S.-China tensions, has reported roughly 30 subsea cable incidents in recent years. In at least one case, Chinese vessels allegedly severed cables deliberately, severing communications for months. In April, China's Ministry of Natural Resources announced a successful deep-sea test of an "electro-hydrostatic actuator"—a device engineered to slice through armored submarine cables at depths of 3,500 meters. Similar suspicious disruptions have surfaced in European waters and beyond, suggesting a pattern of what security analysts call "gray-zone" operations: probing attacks designed to test Western responses while remaining technically below the threshold of declared war.
Badger describes this as hybrid warfare in its purest form. A severed cable can be blamed on a ship's anchor dragging across the seabed, a common accident. A coordinated strike on American undersea infrastructure would be far harder to dismiss. Such an attack could simultaneously disrupt the internet, banking systems, energy markets, and military communications. The economic cost would be staggering. But Badger argues the real damage would be political—the chaos and instability that would follow, the fracturing of public confidence, the paralysis of decision-making at the highest levels.
China could weaponize this vulnerability in ways that go beyond pure economic disruption. Badger suggests that Beijing might target American cable landing points not to achieve military victory, but to break American public resolve on Taiwan. The logic is coldly strategic: sever the cables, create domestic chaos, and Americans may lose the will to defend an island thousands of miles away. Taiwan itself sits at a critical juncture in the artificial intelligence revolution, controlling much of the world's most advanced semiconductor manufacturing. The Taiwan Strait is not just a geopolitical flashpoint; it is an economic chokepoint.
The urgency of the threat has begun to register in Washington. In April, Senators John Barrasso, a Wyoming Republican, and Jeanne Shaheen, a New Hampshire Democrat, introduced the bipartisan Strategic Subsea Cables Act of 2026, legislation aimed at strengthening the security and resilience of this critical infrastructure. Barrasso emphasized the scale of what is at stake: cables that carry 99 percent of global internet traffic and support $10 trillion in daily financial transactions.
Yet experts caution against overreading every cable break as a deliberate attack. Anniki Mikelsaar of the Oxford Internet Institute notes that between 150 and 200 cable breaks occur globally each year, the vast majority of them accidents. The growth of artificial intelligence is placing new demands on cable capacity, increasing the frequency of maintenance and repair work. Not every incident is a harbinger of coordinated warfare.
Still, the vulnerability remains. As President Trump prepares to meet with Chinese President Xi Jinping in Beijing for talks expected to touch on trade, artificial intelligence, and Taiwan, the question of undersea cable security looms in the background. The cables themselves will carry the data of those negotiations across the ocean floor, fragile threads connecting two great powers in an era of deepening strategic competition.
Notable Quotes
America depends on the fragile nervous system of subsea cables for modern life, and adversaries seek to turn the bottom of the ocean into a battlefield.— Andrew Badger, former Pentagon official and chief strategy officer at Coalition Systems
A coordinated strike on American undersea infrastructure could fundamentally disrupt our way of life—the internet, banking, energy markets and military communications all run through these cables.— Andrew Badger
The Hearth Conversation Another angle on the story
Why would China bother with cables when it could just attack Taiwan directly?
Because cables give them leverage without triggering a war. Sever the cables, create chaos at home, and Americans might decide Taiwan isn't worth the cost. It's coercion without a shot fired.
How many cables are we talking about? Is it like a handful of critical ones, or thousands?
Thousands, laid across the ocean floor. But they're not evenly distributed. Some routes are more critical than others, and some are more exposed. That's part of the problem—we know where the vulnerabilities are, and so do they.
The article mentions China tested a cable-cutting device. How confident are we that was actually about cutting cables?
They announced it publicly, called it an "electro-hydrostatic actuator." Whether it was explicitly designed for cables or just happens to be capable of cutting them—that's the ambiguity. It's plausible deniability built in.
So what does defending this actually look like? More cables? Better guards?
Redundancy, mostly. More routes, more diversity. Faster detection and repair. International agreements on what counts as an attack. Right now, there's no consensus on that last part.
And if China did cut cables during a Taiwan crisis, what would actually happen here?
Banking would seize up. Stock markets would halt. Military communications would degrade. But the real damage would be the panic—the sense that the government can't protect basic infrastructure. That's what they're counting on.