Fibre-optic Link Around the Globe (FLAG) is a 28,000-kilometre-long (17,398 mi; 15,119 nmi) fibre optic mostly- submarine communications cable that connects the United Kingdom, Japan, India, and many places in between. The cable is operated by Global Cloud Xchange, a former subsidiary of RCOM. Meta (formerly Facebook) plans to build the world's longest undersea cable that will be longer than the Earth is round. The high-capacity, fiber-optic cable that will link five continents will span a fantastic 31,000 miles (50,000 km) – for reference, the circumference of the Earth is 24,901 miles. The worlds longest submarine telephone cable is FLAG (Fibre-optic Link Around the Globe), which runs for 27,000 km 16,800 miles from Japan to the United Kingdom. It links three continents (Europe, Africa and Asia) and 11 countries, and can support 600,000 simultaneous telephone calls. The project, which connects East and West Africa with Europe, the Middle East and South Asia, is designed to. SEA-ME-WE3, which stands for South-East Asia – Middle East – Western Europe 3, is a submarine fiber-optic telecommunications cable that links these regions, even extending to Australia and Japan. Add Popular Science Adding us as a Preferred Source in Google by using this link indicates that you would like to see more of our content in Google News results. Meta says the estimated 31,000-mile.