Rare enough to make the news should be a freaking hint that something unusual is going on even if you know nothing about he topic. But, in case you where actually confused underwater HVDC cables are far from the norm, which is why people are commenting on it.
As to the topic, if you want to bring up unrelated and experimental storage technology then don’t pretend to be “shocked” that the topic expands.
As to the topic, if you want to bring up unrelated and experimental storage technology then don’t pretend to be “shocked” that the topic expands.