You said — “Egypt’s transport ministry said footage recorded by onshore video cameras of the location of the cables showed no SURFACE maritime traffic...”
They can only state what they know from the facts. To state that, and make it out to be more than “just that” (along with the lack of any further information as to the cause of the failure) — is simply feeding into a lot of “conspiracy-nut-theories” (as we can very well see on this thread).
Note that someone has already posted that these sorts of things happen all the time. They are not any big deal, other than a coming together of a couple of events at the same time, which in the course of natural and normally-occurring “failure events” — you’ll always liable to have a couple of those “failure events” — gang up at the same time and make it to be a bigger deal than it would normally be.
Until there is any solid information to the contrary that it is *not* one of the normally occurring failure events — there’s no use in jumping to “conspiracy-nut-theoretical-thinking-processes” in saying that one “knows” what is happening... LOL...
Regards,
Star Traveler