Hi, Nancy. 200 Watcher class angels sired the original Nephilim. A third of the angels in heaven were cast down. I think they would've numbered in the millions. There have been numerous incursions by the enemy, both before and after the flood.
Today there are both legit and clandestine laboratories that are doing genetic work including blending humans and animals. My question is, "where do their thoughts and ideas come from?" Fallen angels still walk the earth. God has allowed 10% of the demons (dead Nephilim spirits) to remain on earth.
There was an incursion involving a fallen angel named, "Prince Satanial" (not from the Slavonic Enoch). He and a few others came to earth and one can imagine what they may have done. "Note" The Slavolic translation of the book of Enoch has information that other translations don't. I believe that the leaders of the 200 Watcher angels were Samyaza and Azazel.
Though the 200 Watchers were thrown into the abyss, there are other fallen angels that do evil things on the earth. Like give people ideas for things like nuclear weapons. Hindu scripture talks about these beings and their hybrid offspring.
Due to the cries of the dead killed by the Nephilim, God passed judgement on them and caused them to kill each other. It looks like this included the use of nuclear weapons.
This may have also happened on Mars. I've heard that the nukes were the size of the Empire State building. The enemy is there. And there are structures on Venus and Mercury, according to pictures taken by the U.S.S.R. that I have seen. They shouldn't be there. There are other instances like this in our solar system. Is there no bottom to this rabbit hole?
I hope I've answered your question. Bye, Rita.