OK, Ill bite. Suppose he is correct and the world is flat. Then what is underneath it?
Turtles.
It’s turtles all the way down.
Don’t know, we haven’t dug down far enough. See it here, the 2018 segment:
https://www.cbsnews.com/news/the-flat-earth-movement-a-society-of-disbelievers-in-scientific-fact/