also, "elohim" means "the bright ones" and refers specifically to their pale skin

the genetic mutation of white skin, and lactose tolerance both concentrated in the iberomarussians, which might be better known as the "atlanteans" by their most famous kings Poseidon and Atlas

they already had gravity control and antimatter power systems and in most cases where you read "The Watchers" in the old testament, such as Daniel, this refers to the fallen angels. 

 the irish had a special name for them too, the "tuatha de danaan" or "aes dana" and the norse had names for them you can find references to them all through the americas with their pale skin and red/blonde hair and even probably through asia and africa you can find references, the Dogons are one of the most famous ones who managed to keep some facts about the stars near Alpha Centauri that were not known until we discovered how to see X rays