>>536521
>Why even let them dig massive tunnels to begin with? Humans didn't realized.
>They're an illegal rogue state and that territory must belong to a sovereign nation.
They're not, they negotiated some truce at one point for sentient IAs and gave them a self governing territory in the emptiness of the Saudi (or Sahara?) Desert as a compromise early on IIRC.
>Also, if they have no presence on the surface and literally everything of importance is underground, why do they use solar energy at all?
They didn't, their mobile war machines and the surface of their desert was full of solar panels but they actually had batteries and geothermic power plants for all the mobile shit underground.
Which is the reason why blacking out the sun didn't work.
>At which point in the first movie do they reveal everything is underground and the robots were always operating underground?
All the gigantic interconnecting tunnels systems are in the first movie, you're lead to believe it's human construction but it's probably not. Especially since the squids robots are clearly meant for digging.
The reveal is when the president/politicians guy shows Neo the old machinery still working underneath Zion (in the second or third movie).
How the fuck did the firsts "awakened" ended up in the "abandoned" machine capital and then somehow knew how to make the old machinery work?
They didn't.
The machines re-purposed the already largely self-sufficient Zion to house the humans rebels, like when they had been the rebels, it's poetic justice.
As to why they did that it's what the the Architect explain in the second movie, the machines knows the matrix isn't perfect. Some people somehow wake up on their own. But it's not a problem for the machines as long as they control what they do. So they put in place a secondary system, Zion. That will house all the awakened in the same place and will prevent any spontaneity.
And the day it's a problem -> purge.
It's exactly how an anti-virus works, you quarantine the bad code, then you study it, then you delete it.
That's why the 2 other movies get so much gripes, too much of the explanation scenes uses computer logic and references instead of human one.
Because of course the last reveal is that "Zion and the "real world" is just another Matrix based on a different era (the era of the first quarantine system they developed before they created the second matrix workaround) instead of the 1990's.