Explained: US, China's undersea battle for control of global internet grid

Chinese company Huawei is embedding itself into cable systems that ferry nearly all of the world's internet data

A new front has opened in the battle between the US and China over control of global networks that deliver the internet. This one is beneath the ocean.

While the US wages a high-profile campaign to exclude China’s Huawei Technologies Co. from next-generation mobile networks over fears of espionage, the company is embedding itself into undersea cable networks that ferry nearly all of the world’s internet data.

About 380 active submarine cables—bundles of fiber-optic lines that travel oceans on the seabed—carry about 95% of intercontinental voice and data traffic, making them critical for the economies and national security of most