They don't need to. It's already in the Bible and if you trace the chronology of events before and after the event of Noah's ark, you can come out with the date of 4,000 to 5,000 years ago. The world is wasting alot of resources to dig here, dig there to prove the existence of God as if God is hiding underground. Want to find God and to see His existence - look upward to the sky and not under the ground. The countless stars and planets are testimonies of God's handiwork. Digging underground to find God...its a waste of resource!