China warns US with submarine expansion China is rapidly modernising its submarine fleet, though many of its developments remain highly secretive. While the US has long maintained a significant lead in undersea warfare, Beijing is working to narrow this gap by upgrading its submarines, expanding anti-submarine warfare capabilities, and investing in seabed sensors and networked surveillance.Speaking before the US-China Economic and Security Review Commission on 2 March 2026, Rear Admiral Mike Brookes, Intelligence Director of the US Office of Naval Intelligence (ONI), offered insights into China’s submarine plans.Story continues below AdvertisementHe said, by 2027, China's submarine fleet is expected to…