You could visit a mining site and go down haha. How flat do the believers think the world is? Is it supposed to be 2 dimensional or are they saying its a few miles wide or what?
I actually never heard about how they think about the depth of earth.
@Batman: Can you dig "through" earth and fall off?
It is not possible to drill deeper than 7 miles, fossils have been found more than 6,700 metres below the surface.