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Undersea cables -- Huawei's ace in the hole

Chinese telecom giant's strides in vital infrastructure business raise alarm

TOKYO -- While the U.S. is pressuring allies to help keep Huawei Technologies out of 5G cellular networks, the Chinese giant is quietly advancing in the global market for one of the most critical components of telecom infrastructure: undersea cables.

Virtually all of the world's data transmissions go through cables on the bottom of the oceans. Communications satellites are also used, but their share of the data amounts to just 1%. The U.S., Europe and Japan look like they have the cable market locked down, but their dominance may not be as secure as it seems.

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