[mooreds]

Don't forget underseas cables: https://www.submarinecablemap.com/

[ghywertelling]

How about using drone submarines to cut optic fibre undersea cables? Can geolocation coordinates be beamed to submarines deep under water?

[rcxdude]

Communicating with submarines that are deep underwater is pretty hard. There are techniques like ELF (Extremely Low Frequency) but they require a small power station to transmit a few characters a minute.