It's an impressive effort that I've added to my Other Map Collections page. One thing that makes this sort of map possible is that subsea fiber maps usually only have a few generally static endpoints, and of those many are shared. Likewise, the actual path of the fiber under the water isn't critical and therefore doesn't need to be represented, so you can concentrate on who connects what endpoints and at what speed.
For terrestrial networks, this sort of interactive map would get messy after just a few networks are overlaid. Nevertheless, I've been looking for some sort of way to put together terrestrial network data that does what Telegeography's subsea map does - perhaps someone will solve that problem one day too.
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