The flood was a cosmic event which we simply got in the way of and which nothing could have saved us from. The entire solar system was impacted, not just our own planet.
Chapter Six of Genesis begins with a cryptic, concise statement of the moral decay and corruption that had gradually filled the earth since the children of Adam and Eve began to populate the Pre-Flood world.
"When men began to multiply on the face of the ground, and daughters were born to them, the sons of God saw that the daughters of men were fair; and they took to wife such of them as they chose. Then the LORD said, 'My spirit shall not abide in man for ever, for he is flesh, but his days shall be a hundred and twenty years.'
"The Nephilim were on the earth in those days, and also afterward, when the sons of God came in to the daughters of men, and they bore children to them. These were the mighty men that were of old, the men of renown. The LORD saw that the wickedness of man was great in the earth, and that every imagination of the thoughts of his heart was only evil continually. And the LORD was sorry that he had made man on the earth, and it grieved him to his heart. So the LORD said, 'I will blot out man whom I have created from the face of the ground, man and beast and creeping things and birds of the air, for I am sorry that I have made them.'
"But Noah found favor [grace] in the eyes of the LORD. These are the generations of Noah. Noah was a righteous man, blameless in his generation; Noah walked with God. And Noah had three sons, Shem, Ham, and Japheth.
"Now the earth was [thoroughly] corrupt in God's sight, and the earth was filled [continually] with violence. And God saw the earth, and behold, it was corrupt; for all flesh had corrupted their way upon the earth." (Genesis 6:1-12)
The term, "the sons of God" (bene elohim) in Gen. 6:1 almost certainly refers to the angels. (See Job 1:6, 2:1, 38:7). This is the preferred interpretation of most scholars today and is consistent with 1 Pet. 3:18-22, 2 Pet. 2:4-5, and Jude 6-7. Although Christian men and women are called "sons of God" or "children of God" in the New Testament, the term bene elohim refers to the angels in the Old Testament. Although the angels in heaven evidently are not sexually active (Mark 12:25) this does not mean that they lack reproductive ability. Fallen angels may also be able to introduce genetic alterations into the human gene pool through demon possession of susceptible individuals, evidently especially women. In one way or another, one particular group of fallen angels apparently "possessed" human males --or perhaps in some way had direct sexual intercourse with human females--with the end result that a race of fallen giants, the Nephilim and/or Rephaim, was brought into the world prior to the Flood.
Gen. 6:4 says this genetic impregnation of human women by fallen angels also occurred after the Flood, leading at that time to the giants such as Goliath or Og, King of Bashan. (Numbers. 13:33, 1 Sam. 17). Deuteronomy 18:10 describes Og's bedstead, "...behold, his bedstead was a bedstead of iron; is it not in Rabbah of the Ammonites? Nine cubits (13.5 feet) was its length, and four cubits (6 feet) its breadth, according to the common cubit."
David's slaying of the giant Goliath is recorded in 1 Samuel 17 where we learn how big he was, "And there came out from the camp of the Philistines a champion named Goliath, of Gath, whose height was six cubits and a span (9.5 - 10.8 ft). He had a helmet of bronze on his head, and he was armed with a coat of mail, and the weight of the coat was five thousand shekels (~125 pounds) of bronze. And he had greaves of bronze upon his legs, and a javelin of bronze slung between his shoulders. And the shaft of his spear was like a weaver's beam, and his spear's head weighed six hundred shekels (~15 pounds) of iron; and his shield-bearer went before him."
Genetic defects seem to be associated with these giants. 2 Samuel 21:18-22 records the following glimpse of the giants still living in Israel in the time of King David, "After this there was again war with the Philistines at Gob; then Sibbecai the Hushathite slew Saph, who was one of the descendants of the giants. "And there was again war with the Philistines at Gob; and Elhanan the son of Jaareoregim, the Bethlehemite, slew Goliath the Gittite, the shaft of whose spear was like a weaver's beam. And there was again war at Gath, where there was a man of great stature, who had six fingers on each hand, and six toes on each foot, twenty-four in number; and he also was descended from the giants. And when he taunted Israel, Jonathan the son of Shimei, David's brother, slew him. These four were descended from the giants in Gath; and they fell by the hand of David and by the hand of his servants."
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I believe in allowing the text of Genesis 6 to speak for itself:
"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."
Note the reference twice in this passage to the impending destruction of "all flesh," except for those harbored in the Ark.
So, again, God had very specific reasons for sending the flood and taking out every living thing. Satan and the angels who chose to rebel against God with him were attempting to pollute the human gene pool to prevent the birth of Jesus Christ. They mated with human women and produced offspring called "Nephilim". The only family who was, as God put it, "perfect in his generations", or who had not been contaminated by fallen angels, was Noah's.
So as we see from the word of God, the Flood was not an accident; it was a specific act of God done for the purpose of cleansing the earth and beginning again with uncontaminated human beings who would start a new generational line which would result in the birth of Jesus Christ.
God has a purpose for everything He does.
Do you have any info on what exactly happened and how it affected the solar system?
Thanks in advance