The US-China tech cold war is moving undersea

Subsea cables are the next technological battleground

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    • The Strait of Malacca, the narrow passage between Indonesia, Malaysia and Singapore, hosts a dense concentration of undersea cables.
    • The Strait of Malacca, the narrow passage between Indonesia, Malaysia and Singapore, hosts a dense concentration of undersea cables. PHOTO: ST
    Published Mon, Oct 26, 2026 · 03:57 PM

    WHEN Australia’s Defence Minister Richard Marles described the seabed as a battlefield at a regional defence gathering in Singapore earlier this year, he was preaching to the converted.

    The security of undersea cables – which carry more than 95 per cent of data flows and trillions of dollars of daily financial transactions – was already top of mind for the senior military brass, geopolitical analysts and government ministers in the room.

    A new project by Australia, the UK and the US was quickly announced to develop underwater drone technology to protect cables by 2027, while Singapore launched a 17-country framework covering South-east Asia, Europe, the Middle East and Oceania to explore defence cooperation on critical infrastructure.