Data flows under the oceans. To get from the US to Europe, for example, internet traffic doesn’t beam by satellite—it rushes through subsea cables. There are about 378 of these pipes, and the information that travels through them does so on glass fiber. While many of these tubes cross the Atlantic, Google is building a new one that they say will be the highest-capacity cable to snake under that ocean. Here’s what to know about how it will work.

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