C61 When the Iron Eagle Flies

"— But it won't be any shorter than two hundred thousand years," Darwin added. "After all, sensitive organs already exist in single-cell organisms, and even existed before the appearance of the brain. If you regress to a mindless state now, how many years would you need? "

"..." I feel like my brain is almost gone.

"This place is a naturally formed, sealed ecosystem," Sayaka praised.

Indeed