[Myrddin]

That's not very good opsec. Tee hee, you didn't get us. Our redundant connectivity is over here. If it's really a deliberate attack on the connectivity, the last thing you wanted to do was expose the location. The bad guys are rumored to have some subs. Communications cables are a soft target with a big payback.

[CarrotAndStick]

I do not think the path of submarine cables is unknown to most governments. Detailed route maps can be swiped off the internet.

Besides, terrorists can always buy intelligence from governments like Russia and China.