The US-China tech rivalry has escalated into a deeper battle over undersea fibre-optic cables powering the global AI boom. As demand for cross-border data to power and train advanced systems intensifies, so does the high-stakes battle to control critical network ecosystems – mainly submarine cables that send nearly 99 per cent of intercontinental data traffic at immense speed. Beijing on Tuesday accused Washington of “politicising” global undersea cable networks, following reports that the US...