Big trees video, from the time before time.

Enoch, father of methuselah, great grandfather of Noah wrote a book about the nephilim watchers breeding with human women and making giants, drinking blood, eating people, raping.
God sent angels to cut the world tree, sinking Hyperborea, eden, north pole, access to Atlantis.
So that the children of the fallen angels, the giants couldn't climb the big trees to survive the flood.