"Around 570 cables (plus a further 80 planned) carry between 95% and 99% of the world's intercontinental telecommunications data," reports CNN (since fiber cables offer speeds of terabits per second, carry much more data than satellite links). And "networks of green energy cables carrying electricity are also starting to sprawl across the world's seabeds."

Now to protect them, the U.S., Australia and the U.K. "are planning to develop new unmanned undersea vehicles" as part of their trilateral security partnership.

Western governments see a growing risk of Russian and Chinese sabotage of undersea cables and are also concerned that Iran may seek to exploit the many data networks running thr...