Check out LA Marzulli and Stephen Quayle. Both have done a lot of research on this topic. Jeffrey W. Mardis has a couple of awesome books on this as well.
I'm going to watch this now. The story of the descent of the Watchers to breed on mortal women a hybrid super-race is the most fascinating story in the Bible. Although, it is not really in the Bible at all, having been excluded almost totally from Old Testament books. All we have are a few obscure references to it. Luckily for us, the Book of Enoch has survived to tell us what those references are about. Why was the Book of Enoch kept out of the holy books of the Old Testament? Was it because the information it contains is too dangerous to be revealed to common men?
Edit: Well, I watched it. The guy is full of himself. He doesn't actually say much about the Watchers or their offspring. Toward the end he descends into a tirade of numerology that is just tiresome and silly. Points he makes: he rejects evolution; he rejects archaeology and the accepted scientific timeline of world history in favor of a biblical history. He gives a lot of information of questionable accuracy, but doesn't tie much of it together -- he just vomits it forth in an endless monologue.
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