There, indeed, are vestiges of the former civilizations of that era still buried but recoverable. This is not technology per se but a reflection of the sum total of how those beings lived and comported themselves. This will be a shadow, much as what is visible in the pyramids above ground, tantalizing and intriguing but cryptic. The reason for this is that such treasures are not idly discarded and left indefinitely intact to be discovered by a later era. If anything, there will be a cleanup, cleanout, and coverup to sanitize ruins and remove clues to prior involvement, particularly of the extraterrestrials.
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