The escalating tech rivalry between the US and China has intensified into a critical contest over undersea fibre-optic cables that underpin the global artificial intelligence (AI) boom. These submarine cables carry nearly 99% of intercontinental data traffic at high speeds, making them vital for powering and training advanced AI systems.

On Tuesday, July 31st, 2026, Beijing accused Washington of "politicising" global undersea cable networks following reports that the US intends to invest US$175.8 million to replace ageing lines in the Caribbean and Central America. The move is seen as an effort to block Chinese involvement in these critical infrastructure projects.

China's foreign ministry warned that this US action risks threatening the broader digital economy. Ministry spokesman Lin Jian stated, "Politicising and overstretching security concerns on the issue of undersea cables will only disrupt normal rules of the international market, threaten global data connectivity and cybersecurity, and serve the interests of no one."

Lin Jian also emphasized China's support for a multilateral approach, saying, "[China supports] international cooperation on submarine cables under the principles of fairness, justice, equality and inclusiveness."

This development highlights the high-stakes battle to control essential network ecosystems amid surging demand for cross-border data flows crucial to AI advancements.

Sources