Yah, I think undersea cables would be least of worries for sunspot zap. Firstly the large majority are fibreoptic now, and secondly even a few feet of water is a fairly effective screen, so even copper would be protected from picking up stray RF.
RF is not the biggest problem on surface of the Earth or at the bottom of the ocean.
It's the geomagnetic fluctuation caused by CME pushing the Earth's magnetic field over to a point where it "flips" back to it's original position. That's what creates the induction currents to any conductive material - in essence, it's nature's "EMP bomb". Water does not affect magnetic field in any way so underwater cables as well as the related infrastructure is vulnerable to these induction currents.
It's probably pretty much the above surface infrastructure that would take the damage. However, fibre is the go to for that nowadays, and if all the ends are in EMP resistant well shielded data centers, it's only really the local "last mile" bits that are on copper, and could pick up RF.... and of that.. any that are cable TV coax are probably more resistant than UTP, BUT, more UTP is underground than coax so might be a bit of a wash.
Again, RF is not the problem on surface level - it's the magnetic field and the induction currents.
Although this is just an estimate, I would say that it is much more likely that the problems arise from the fact that the electric grid would suffer significantly. It doesn't help much if the underwater cables are ok, if there's no electricity to drive the infrastructure that's needed to make them work. Some (perhaps even most) operators do have backup generators, but those too have limits to how long they can keep the system working. Delivery of oil/gas requires electricity, so when the initial reserves run out there has to be a way to refill - and people motivated to taking care of the refilling in midst of the possibly quite hectic period of global unrest.
Now these are of course just scenarios, and as I've stated many times I do not claim to know the exact scope of what would happen. However, what I do know is that assuming things would be "pretty much ok" in the case of something like direct hit from a Carrington's event simply does not match with what we know from prior experience.
The point is, since there are well grounded reasons to assume that
something will at some point disrupt the international Internet connections up to a level that will cause significant problems in connectivity, it would be rather stupid not to at least consider the affects such situation would/will have on crypto currencies. It would be bad enough to cope with the situation of loss of electricity on a massive scale, and the global finances would be a complete mess anyways. If crypto is to replace fiat as the #1 choice of the mankind, then issues like these can not simply be ignored in good faith.
- Jyri
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Altcoin.Center