Im obviously not Helwig, but Ive read some on giants.
Gen 6:1 And it came to pass, when men began to multiply on the face of the earth, and daughters were born unto them,
Gen 6:2 That the sons of God saw the daughters of men that they were fair; and they took them wives of all which they chose.
Gen 6:3 And the LORD said, My spirit shall not always strive with man, for that he also is flesh: yet his days shall be a hundred and twenty years.
Gen 6:4 There were giants in the earth in those days; and also after that, when the sons of God came in unto the daughters of men, and they bore children to them, the same became mighty men which were of old, men of renown.
The Angels had sex with women and produced Giant offspring. Thats why God destroyed the earth.
Von Daniken has a book titled "Odyssey of the Gods" where he thinks that aliens were the Greek Gods and that they were Giants and had the power of technology. Thus were worshiped as Gods.
EW Bullinger in his companion Bible thinks its a possibility that the offspring of people/fallen angels created Giants that made the Great Pyramid of Giza and other ancient wonders of the past. Since fallen angels are not from earth its no wonder that they had star charts and things like that. Some people think that when Ezekiel is visited in the first chapter of his book, that God was in a spaceship.
Eph 2:2 Wherein in time past ye walked according to the course of this world, according to the prince of the power of the air, the spirit that now worketh in the children of disobedience:
Satan is described as the prince of the power of the air. In Revelations it speaks of war in Heaven.
Rev 12:7 And there was war in heaven: Michael and his angels fought against the dragon; and the dragon fought and his angels,
Kind of like Starwars, I imagine.
Rev 21:2 And I John saw the holy city, new Jerusalem, coming down from God out of heaven, prepared as a bride adorned for her husband.
A space city coming from the stars will land on earth!