The Book of Ech contains accounts of the Watchers, a class of angel, who came to earth, taught humans weapons, alchemy, spell potions, sorcery, astrology, and astromy. The Watchers also slept with human women and produced the Nephilim. For this, they were punished and cast into Tartarus. This is also mentioned in the New Testament. This is an easy to read translation of The Book of Ech with additional information on angels, Watchers, and Nephilim.
Dr. A. Nyland spent her time on Faculty at the University of New England, Australia, teaching ancient grammar and ancient history. She is the best selling translator of such books as The Complete Books of Enoch and author of What Were the Watchers? as well as Nephilim and Giants. The information based on her books is not based on her own opinions, but is presented with a view to getting actual facts out there. This is harder and harder in this day and age with misinformation spreading like wildfire on the net, driven by all the books by authors who know no ancient languages, and get their information from English translations rather than the original texts. It is futile to research ancient texts in English translation.