Look to the Hindus. Vimanas, flying machines describes in their holy books. Atomic warfare, described also. Some go further and tie this back into the Biblical "great men of old, men of renown," the children of the sons of God and women of Earth, meaning that these "gods" were real. Same with the supposedly mythological Greek "gods." Egyptian too. That many were strange chimeras or otherwise physically unusual also ties back in, referencing what has been interpreted as genetic manipulation. Don't necessarily believe this myself, but it does mesh it all together.
I do know about the Vimanas as described in ancient Hindu texts. Did it happen? Why bother to write about events and machines/technology that did not exist?