Another interesting question is if this is just the start of more such incidents. That's a question I've seen raised (not on our site) as early as last year. For example, this analysts report talks about all the high value stuff in the North Sea and how it's rather vulnerable to someone swooping in under the radar and destroying a bunch of stuff (e.g. power lines)
eenvandaag.assets.avrotros.nl/user_upload/PDF/…