Have you ever wondered how many under sea cable lines are there in the world? How does communication tools such as the internet, phone systems work great across most of the countries? I came across a wonderful site that shows in realtime the submarine cable networks in the world. For instance, the Greenland Connect network connects Greenland to Iceland. Similarly you check out the lines that connect any country to another by clicking on the link below.

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Source: SubmarineCableMap.com