How long have 'they' known? It's their fallen father, and how long he has been planning this. Alive for aeons, he doesn't die, 'we' live the short lives, not him. Remember, he did or 'tried' doing this before....and brought the last flood. By water. But with what he has done this time? Water can't be used to just 'wash' it away. They have tampered with us, God in Heaven's creation. It will trickle down into everything. Creation, for all intent and purposes, has been destroyed. Why the coming flood...must be 'by fire'. To burn it all up clean and outright!