Truth. Read Genesis 6. The nephilim giants were also here afterwards...after the flood. These are the tribes that Moses and Joshua were told to kill....men, women, children and even the animals (they defiled?) The nephilim were and are satan's seed, satan's bloodline. Noah was saved because his bloodline/generations were pure.In Genesis 6 Noah is said to be "perfect in his generations". Might that mean that his genetics were pure?:

Genesis 6: 8 Noah found grace in the eyes of Jehovah.
9These [are] births of Noah: Noah [is] a righteous man; perfect he hath been among his generations; with God hath Noah walked habitually. 10And Noah begetteth three sons, Shem, Ham, and Japheth.