The antipode of a point on Earth is the point diametrically opposite it—where you’d end up if you dug a tunnel straight through the Earth. Most land is antipodal to the sea. Above is a map showing antipodal points, with the overlap (orange) showing places where, if you did manage to dig straight through our planet, you’d end up on land. As you can see, if you want to dig straight to China, you better start in Chile or Argentina. Parts of Spain are antipodal to parts of New Zealand, a fact exploited by the first “Earth Sandwich”, a response to a challenge by Ze Frank.