If they destroyed Zion...

If they destroyed Zion at least 1ce. Dont u think that there would be some sorta hole leading directly to Zion from the surface??? Maaybe the Architect is possibly lieing to Neo.

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Or Zion is in a different place each time.

Maybe niobe and ghost will find a previous zion in revolutions.

Thats a cool theory since they have ventured somewhere unknown in Enter the MAtrix.

That would be cool.
what if they found suvivors from the old one?

I dnt think thats possible. If the robots did destroy Zion, than they shouldnt be able to miss anyone. The robots must probably destroyed all the machines to produce food and water leaving nothing for the survivors if any. As the architect said that the have become very good at destroying Zion.