If you are interested, there is actually quite a bit out there these days, as archeologists have done things like excavate quarries and workshops and found a number of works in progress that were abandoned. They were incredibly good at what we consider high order math to define curves and planes in 3D, even for things like busts that aren't obviously mathematical at first glance, and had some very practical ways to get quite large objects flat and square, some of which weren't rediscovered by others until the early 1900s.
And, they know immediately if power is out. The smart meter transmit on the power lines, and get pinged every few minutes. If they loose all the meters fed by a line or transformer, they know something is wrong and they dispatch the line crew.
Vegas gets very little power from Hoover. The State of Nevada, didn’t see any use for it when the agreements were being written, asked for none, and were pissed that the Bureau of Reclamation made them take some. Las Vegas Valley Water District and the Southern Nevada Water Authority do have dedicated rights to power from the dam, and use it to pump water to the Vegas Valley.
More and more municipalities are having to stick a straw into Lake Michigan to get water instead of ground water. There is only so much water to go around.
I’m pretty sure we could figure it out. The archeologist just recently figured out the purpose of the thousands of round rocks they kept finding at Stonehenge.. They were ball baearings which ran in oak tracks, from the river where they were landed to the site. They have known about the round rocks for a couple of centuries. Sometimes it takes someone from an outside specialty to look at it for a minute.
