The silurian hypothesis is about another smart civilization on earth.
the crust surface under the sea is tectonically recycles more often then land crust
cetaceans as whole returned to the ocean somewhere like 50 million years ago
So there we have it. It’s a bunch of species of futuristic super smart water mammals or whatever they evolved into.
“Smart” could mean a lot of things. Animals can be relatively smart. What makes humans special is out capacity for language. We have the musculature to create audible language, and the specialized neural lobes dedicated to creating and deciphering it.
Language, along with our advanced prefrontal cortex, creates the opportunity for knowledge transmission. I can tell my kids everything I’ve learned, and they can learn more and tell their kids.
Some animals have some of these abilities. Dolphins have large prefrontal cortices. Whales sing songs with tons of information we haven’t even deciphered yet. Parrots can create language. Great Apes can be taught to understand language. Crows make and use tools, and teach other crows to do the same. But so far, we haven’t found any animals that can pass down unlimited information the way humans do.
Interstellar space travel would require either super advanced technology or hyper-specific biological adaptations. The idea that whales showed up from another planet and became the whales we know today doesn’t make a lot of sense in the revolutionary record. Now, if you said crustaceans or lichen or something were ancient aliens, that would feel more believable.
okay then… “Smart” whales that evolved 50 million years ago with language abilities and are now responsible for the UAP sighting we see around the world.
With your extra information it seems even more reasonable that during this time some cetacean with comparable to human or higher language abilities evolved.
So far we have a limited understanding of the undersea world and any whale or dolphin descendant that can create what is seen is certainly able to keep themselves hidden if they wanted to.
No one said anything about whales coming from space though…? Not sure where you got that notion. The idea that a branch on the tree of life is suddenly from another world seems ridiclious don’t you think?