Shawn and James talk about how big the earth is and how little of it we've actually experienced from a geological standpoint.

Earth's crust - Wikipedia

Pitch Drop experiment - School of Mathematics and Physics - University of Queensland (uq.edu.au)

Kola Superdeep Borehole - Wikipedi

The Siberian Hell Sounds (skeptoid.com)

Deepest cave in the world

The Largest and Deepest Mines in the World | General Kinematics

How Do Scientists Know the Structure of the Earth's Interior? (sciencing.com)

Journey to the Center of the Earth by Jules Verne