One important question that I'm unclear on is how long it takes to fix one of these cables. If it takes months then that is quite a wide window in which an attacker could incrementally take down cables.

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Shhh, or somebody will realize how much slack there is in the system (for very good reasons, as evidenced here) and "optimize" it away...

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Can anyone explain why there wasn't any BGP activity on the Finland-Germany systems when the cable broke, while for Lithuania there was a massive spike?

Unfortunately it's been a long time since I learned about BGP, if anyone could help out here I'd be grateful.

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