Did the seed survive after Noah and start again? I heard Nimrod may have been 25 feet tall? Maybe all it took was for Ham not to follow the will of God?
Genesis 9:18-25 (NIV)
18 The sons of Noah who came out of the ark were Shem, Ham and Japheth. (Ham was the father of Canaan.) 19 These were the three sons of Noah, and from them came the people who were scattered over the whole earth. 20 Noah, a man of the soil, proceeded[a] to plant a vineyard. 21 When he drank some of its wine, he became drunk and lay uncovered inside his tent. 22 Ham, the father of Canaan, saw his father naked and told his two brothers outside. 23 But Shem and Japheth took a garment and laid it across their shoulders; then they walked in backward and covered their father’s naked body. Their faces were turned the other way so that they would not see their father naked. 24 When Noah awoke from his wine and found out what his youngest son had done to him, 25 he said, “Cursed be Canaan! The lowest of slaves will he be to his brothers.”
Some have speculated that the wife of Ham may have been “serpent seed,” but there is no support for that theory to be found in God’s word.
To me, the curious thing is why, if Ham did the disgraceful acts, did the curse fall upon Caanan, specifically, and not the rest of Ham’s lineage?
BTW, Nmrd was a descendant of Ham through Cush.
I do not see any way the seed of the nephilim could have survived the Noah Flood. If Nimrod were exceptionally tall (and I'm not aware of any ancient manuscript supporting that view) then I'm confident it would not be because offspring of the Watcher-angels and mortal women physically survived (Genesis 6-7)
Also, the only reason I can perceive why Canaan was singled out in the Noah curse would be that Noah was speaking prophetically, i.e. God sees the end from the beginning.