Oh, and apparently we've been doing this since 1901, with successful submarine trials (domestically) going back to the 1840s. I had no idea it went back that far!
They've had some upgrades, of course. At the time, they were telegraphy cables. Later telephone. And now, we're on multi-terrabits-per-second optical fibers.
The map looks surprisingly similar. Makes me think there are probably highly-specific terrain considerations that lend itself to these routes?
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