Undersea cables become a US-China battleground, and the Caribbean is exposed

Washington is tightening the rules on who may build the cables that carry the world’s data. Beijing calls it fearmongering. For small Caribbean states that hang on a handful of these lines, the stakes are practical, not ideological.

The floor of the ocean has become contested ground in the rivalry between the United States and China, and the small states that depend on a few thin strands of glass for their link to the world have the most to lose. Two developments this summer show how quickly undersea cables have moved from obscure engineering to hard politics.

On 25 June the US Federal Communications Commission voted to tighten the rules governing who may build and connect the submarine cables that land on American shores. The measures presumptively bar applicants owned or controlled by governments Washington designates as foreign adversaries, a list that includes China, and they restrict capacity-sharing deals with such firms while extending oversight to the terminal equipment that links cables to onshore networks. Operators that meet heightened security standards and avoid designated foreign equipment are offered faster approval. FCC Chairman Brendan Carr has said the cables face threats from “foreign adversaries, like China”.

US officials have argued for more than a year that Chinese involvement in the roughly 500 cables carrying almost all of the world’s international data traffic creates openings for espionage and disruption. They point to the Salt Typhoon intrusions into American telecoms networks, to warnings from Taiwan about threats to its cables, and to repeated damage to lines in the Baltic Sea. Attribution in many of those incidents remains contested and often lacks definitive public proof.

Beijing rejects that framing. At a foreign ministry briefing on 28 July, responding to reporting that Washington was worried about Chinese cables across the Pacific and into the Americas, spokesperson Lin Jian described undersea cables as civilian infrastructure that serves people in every country. He warned that treating the sector as a security matter would “serve no one’s interest”, and said China backs cooperation on cables under principles of fairness and inclusiveness. Chinese officials cast the exclusion of capable suppliers as protectionism dressed up as security.

Each side accuses the other of bad faith. Washington presents Chinese cable projects as a route to controlling or monitoring the physical layer of global communications, citing China’s civil-military fusion policies. Beijing presents the security label as a device to shut out a competitor it can no longer beat on price or technology. Independent analysts note that most cable faults, around 200 a year, stem from accidents and natural causes rather than sabotage, even as the strategic value of the network makes it an obvious target.

What it means for the Caribbean

For St Vincent and the Grenadines and its neighbours, the contest is not abstract. Caribbean networks hang on a small number of submarine and terrestrial paths, so a single fault can take out a disproportionate share of a country’s connectivity. On 21 June a fibre cut near the region sent traffic on Karib Cable’s network close to zero, and Saint Lucia’s overall internet traffic fell by roughly 60 per cent for the better part of a day before service recovered.

Incidents like that one, most of them accidental, are the everyday risk that matters most to the region. The International Telecommunication Union and the International Cable Protection Committee have urged countries to diversify cable routes, speed up repairs, and strengthen the rules that protect landing stations. For Caribbean governments, reliable and affordable connectivity is the priority, whatever the nationality of the company that lays the line.

That is where great-power rivalry cuts against the region’s interests. When every fibre-optic line is treated first as a security asset, smaller states risk delayed projects, higher costs, and pressure to choose a side. St Vincent and the Grenadines has little influence over how Washington and Beijing settle their contest. It has every reason to insist that the networks it relies on stay resilient, redundant and open, rather than becoming casualties of a fight it did not start.

Sources: FCC Second Report and Order (25 June 2026); Chinese Ministry of Foreign Affairs press briefing (28 July 2026); Cloudflare Radar; International Telecommunication Union and ICPC. Original analysis by Vincypowa News.