The New Cold War Is Digital: US vs China in AI, Chips & Submarine Cables
Jensen Huang flew to Beijing in May, sat through two days of Trump-Xi talks, and came home with no decision on Nvidia's most advanced chip. Three months later, on August 19, the decision arrived without a summit: Washington cleared the H200 for export, and ByteDance and Tencent reportedly received roughly 10,000 units each within weeks. That single approval says more about the US China digital cold war 2026 than the trade truce that made headlines in May — this contest runs through export licenses, cable landing permits, and repair-ship contracts most people never read about. Four companies build nearly every undersea cable on the planet, and one of them is Chinese state-linked. Sixty specialized ships worldwide can fix a cable once it breaks, and Beijing controls a disproportionate share of that fleet too. Chips get the headlines because a chip has a brand name and a price tag. Cables get almost none, because nobody buys one at a store — which is exactly why the physical layer of the internet has become the quieter, harder-to-track front in this rivalry.
Most coverage of this rivalry stops at semiconductors: export bans, entity lists, TSMC's market share, Huawei's latest chip. That's the visible half. The other half sits at the bottom of the ocean, where a Chinese-crewed ship anchored near a cable for two days can cut off an island's telecommunications faster than any tariff, and where China's HMN Technologies — formerly Huawei Marine — already handles repair and maintenance work on close to a quarter of the planet's subsea cable network. Analysts who track chip export controls rarely track cable landing licenses. The two systems sit with different agencies, get covered by different reporters, and almost never appear in the same article, even though a country locked out of advanced chips can still lose ground by losing its cables first.
By the close, you'll have a map of who actually owns and repairs the cables carrying nearly all of that data, the incidents off Taiwan that show what a cut cable costs in practice, and Nvidia's collapsed, then partially restored, China market share set against the infrastructure fight nobody has priced in yet.
In this piece:
- Four companies build nearly all of the world's undersea cables
- Taiwan's cable-cutting incidents show what "gray zone" actually means
- The chip ban that reversed itself in ninety days
- What happens to you when a cable is cut
- Congress and the White House don't agree on how to win this
- Where the two fights actually meet
Four Companies Build Nearly All of the World's Undersea Cables
Four private firms build and install nearly every undersea cable on the planet, and one of them answers to Beijing. SubCom (United States), Alcatel Submarine Networks (France), NEC (Japan), and HMN Technologies (China, formerly Huawei Marine) together handle roughly 98 percent of that construction work, according to CSIS. The 1.2 million kilometers of cable they lay carry more than 99 percent of intercontinental data and an estimated $22 trillion in transactions on an average workday. HMN Technologies alone already manages repair and maintenance work on close to a quarter of the world's subsea network, based on TeleGeography-sourced reporting — construction share is one number, but ongoing physical access to cable already buried on the seafloor is a different one, and no chip export ban covers that kind of access, because it isn't a chip.
| Company | Home country | Role |
|---|---|---|
| SubCom | United States | Cable manufacturing & installation |
| Alcatel Submarine Networks | France | Cable manufacturing & installation |
| NEC | Japan | Cable manufacturing & installation |
| HMN Technologies | China | Manufacturing, installation & ~25% of global repair work |
Taiwan's Cable-Cutting Incidents Show What "Gray Zone" Actually Means
Six separate cable-damage incidents around Taiwan since early 2023 form the clearest test case for what "gray zone" activity actually costs. In February 2023, Chinese-registered vessels severed two cables serving the Matsu Islands, knocking them offline for weeks. A Chinese-crewed ship was linked to damage on the TPE cable in January 2025, another to the TPKM-3 cable near Penghu that same February, and a third — the Hai Hong Gong 66 — to the Taiwan-Matsu No. 3 cable in April 2026. Each time, Taiwan's coast guard opened an investigation under national-security-level guidance rather than treating the break as routine. Zhu Fenglian, spokesperson for China's Taiwan Affairs Office, told reporters that cable damage is a "common maritime accident" that happens more than 100 times a year worldwide.
The difference between two of those incidents wasn't the cable — it was whether a backup route existed first. When the Taiwan-Penghu No. 3 cable was severed in February 2025, Chunghwa Telecom rerouted traffic within hours and the outage barely registered outside a coast guard report. When two cables were cut off Matsu in February 2023, no backup route existed, and the islands' roughly 14,000 residents lost stable internet access for weeks. Redundancy, not diplomacy, decided which island stayed connected.
The Chip Ban That Reversed Itself in Ninety Days
Washington's tightest restrictions on advanced AI chip sales to China produced the opposite of their stated goal, then got partly reversed. Nvidia's share of China's AI chip market fell from roughly 95 percent before the strictest controls to near zero on new shipments by mid-2026, according to trade analysis from Model Diplomat. On August 19, 2026, the Bureau of Industry and Security cleared H200 exports, and ByteDance and Tencent had received roughly 10,000 units each within weeks. Nvidia CEO Jensen Huang had already warned publicly that restrictions this tight risked pushing China toward faster self-sufficiency instead of slowing it down. That's the failure most chip-war coverage skips: the ban's stated purpose was to deny China frontier AI training capacity, and for roughly a year, the practical effect was to hand the domestic market to Huawei's Ascend line instead of denying anyone anything.
"We are caught up in the middle."— Frank Huang, Taiwanese chip executive, NPR
What Happens to You When a Cable Is Cut
A single cable break rarely blacks out a country, but it changes your day in ways you'd never trace back to the ocean floor. Your card payment routes through a longer path and takes an extra second to clear. Your video call drops and reconnects over a detour with more latency. Your cloud backup queues instead of finishing instantly. Amazon, Google, Meta, and Microsoft now own or lease roughly half of all undersea bandwidth worldwide, so their traffic engineers are usually already rerouting you before your own provider notices anything happened.
Fixing the break is a separate problem, and the numbers there don't match the map. An estimated 60 dedicated repair ships service 1.5 million kilometers of cable worldwide. China controls a disproportionate share of that fleet through state-linked operators like Shanghai Salvage Company, concentrated in the South and East China Seas. The US and allied fleet sits mostly in the North Atlantic, thin in the Indo-Pacific, where more than half of regional internet traffic funnels through a handful of narrow straits.
Two chokepoints — the Luzon Strait and the Singapore Strait — carry a disproportionate share of that regional traffic, and the repair ships equipped to fix a break in either one are disproportionately flagged to the country whose vessels keep showing up near the last several breaks.
Congress and the White House Don't Agree on How to Win This
Eight bipartisan lawmakers want a total ban on chipmaking-equipment sales to China; the administration is still negotiating case by case. In February 2026, that group sent Commerce Secretary Howard Lutnick and Secretary of State Marco Rubio a letter arguing that entity-specific controls had already failed, since equipment crossing the border becomes nearly impossible to police afterward. The White House's approach — license by license, reversible on a single trip to Beijing — bets that access can be traded for verifiable end-use guarantees instead of denied outright. Neither camp has proof the other is wrong yet, and that gap is the actual disagreement driving the policy whiplash, not any dispute over whether China is a problem. No one running either strategy has been proven right.
Where the Two Fights Actually Meet
Britain cut Germany's transatlantic cables within hours of declaring war in 1914, and the tactic never really went away. A British cable ship severed five German lines before Berlin's own foreign office had finished confirming the war had started, forcing German communications through channels British intelligence could read for the rest of the conflict. A century later, the tool changed from cable-cutting ships to entity lists and export licenses, but the logic underneath is identical: control the pipe, and you don't need to win the argument happening inside it. Everyone involved calls today's incidents accidents until proven otherwise. Almost nobody actually believes that.
Verdict: Watch the Cables More Than the Chips
The infrastructure fight deserves more of your attention right now than the chip fight does. Chip policy reversed within roughly ninety days on the strength of one Beijing summit and a single BIS ruling. Cable ownership and repair-fleet composition took more than a decade to build and can't be undone by any single meeting — that asymmetry is the whole argument.
- If you only track export-control headlines: you'll miss the slower, harder-to-reverse shift already underway on the seafloor.
- If chips still matter more to you: that's fair for near-term AI training capacity — but cables set the resilience floor underneath everything else, chips included.
Who this is for: telecom and infrastructure risk analysts weighing where the real control sits, congressional staffers drafting the next round of cable-security legislation, and readers who've noticed that every "cold war" explainer they've read stops at semiconductors.
Nobody has built an international mechanism that can actually distinguish sabotage from accident on a severed cable, and until someone does, both governments get to keep calling the same category of incident whatever framing suits them that week.
Frequently Asked Questions
What is the US-China digital cold war?
It's the ongoing contest over who controls the physical and digital infrastructure carrying global data and AI compute — chips, cloud access, and undersea cables. Unlike the original Cold War, the fights play out through export licenses and construction contracts rather than open conflict, and outcomes can reverse within months.
How many submarine cables does China control?
China's HMN Technologies participates in construction and handles repair or maintenance work on roughly a quarter of the world's subsea cable network. Four companies overall — American, French, Japanese, and Chinese — build about 98 percent of all undersea cables globally.
What happens if an undersea cable is cut?
If a backup route exists, traffic reroutes within hours and most users notice nothing beyond added latency. If no backup exists, as with Matsu in 2023, an entire population can lose stable internet access for weeks until a repair ship arrives and completes the fix.
Why did the US reverse its Nvidia H200 export ban?
Washington cleared H200 exports to China on August 19, 2026, after nearly a year of restrictions that had pushed Nvidia's China market share toward zero without stopping Chinese AI development. The reversal followed months of pressure from Nvidia and a partial trade truce agreed at the May 2026 Trump-Xi summit.
Are US chip export controls working?
Results are mixed. Controls slowed China's access to the most advanced chips, but also accelerated domestic alternatives like Huawei's Ascend line and pushed some Chinese firms to rent restricted compute through Southeast Asian data centers instead of buying hardware outright.
Why are cables around Taiwan being cut?
Taiwan has recorded at least six cable-damage incidents since 2023 involving Chinese-linked vessels, which Taiwanese authorities investigate as possible "gray zone" sabotage. Beijing calls the same incidents routine maritime accidents, a category that its own officials say occurs more than 100 times a year worldwide.
Is China responsible for undersea cable damage near Taiwan?
Taiwan has not conclusively proven intent in most cases, and China denies responsibility. What's verifiable is that Chinese-crewed or Chinese-owned vessels were present at the time of each break, and Taiwan's coast guard has classified several incidents as suspected gray-zone activity rather than accidents.
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