Regarding the Great Flood.
The Nephilim were Fallen Angels, sons of God, who had gone to Earth and taken human wives. This angered God....
"The Nephilim were one of the primary reasons for the great Flood in Noah's time. Immediately after the Nephilim are mentioned, God's Word tells us this, "The LORD saw how great man's wickedness on the earth had become, and that every inclination of the thoughts of his heart was only evil all the time. The LORD was grieved that he had made man on the earth, and his heart was filled with pain. So the LORD said, "I will wipe mankind, whom I have created, from the face of the earth — men and animals, and creatures that move along the ground, and birds of the air — for I am grieved that I have made them" (Genesis 6:5-7). So, God proceeded to flood the entire earth, killing everyone and everything (including the Nephilim) other than Noah and his family and the animals on the ark (Genesis 6:11-22)."
and...
One by one the angels of heaven are appointed by God to proceed against the Watchers and their offspring the Nephilim, described as 'the bastards and the reprobates, and the children of fornication'. Azazel is bound hand and foot, and cast for eternity into the darkness of a desert referred to as Dudael. Upon him are placed 'rough and jagged rocks' and here he shall forever remain until the Day of judgment, when he will be 'cast into the fire' for his sins. For their part in the corruption of mankind, the Watchers are forced to witness the slaughter of their own children before being cast into some kind of heavenly prison, an 'abyss of fire'. Although the Watchers' leader, Shemyaza, is cast into this abyss alongside his brothers, in other versions of the story he undergoes a more dramatic punishment. Since he was tempted by a beautiful mortal maiden named Ishtahar to reveal the Explicit Name of God in exchange for the offer of carnal pleasure, he is to be tied and bound before being made to hang for all eternity between heaven and earth, head down, in the constellation of Orion."
Also...
"And God said to Noah, 'I have determined to make an end of all flesh; for the earth is filled with violence through them; behold, I will destroy them with the earth. Make yourself an ark of gopher wood; make rooms in the ark, and cover it inside and out with pitch. This is how you are to make it: the length of the ark three hundred cubits, its breadth fifty cubits, and its height thirty cubits. Make a roof for the ark, and finish it to a cubit above; and set the door of the ark in its side; make it with lower, second, and third decks.
"For behold, I will bring a flood of waters upon the earth, to destroy all flesh in which is the breath of life from under heaven; everything that is on the earth shall die. But I will establish my covenant with you; and you shall come into the ark, you, your sons, your wife, and your sons' wives with you.
"And of every living thing of all flesh, you shall bring two of every sort into the ark, to keep them alive with you; they shall be male and female. Of the birds according to their kinds, and of the animals according to their kinds, of every creeping thing of the ground according to its kind, two of every sort shall come in to you, to keep them alive. Also take with you every sort of food that is eaten, and store it up; and it shall serve as food for you and for them.' Noah did this; he did all that God commanded him."
So... God was attempting to savour mankind, to rid it of evil this was God's justification for the Flood.
Incidently, one of the Fallen Angels (The Nephilim/The Watchers) was called 'Anakim'... perhaps where Star Wars 'Anakin' came from eh?
