Because it’s possible, two men on exact opposite sides of the planet (antipodes) from each other, coordinated to create an “Earth sandwich.” One slice of bread in New Zealand, 12,724km of rock, magma, iron, etc., and one slice of bread in Spain.
If you’re asking, “why?” you’re reacting incorrectly. “Awesome!” is more appropriate.
Don’t tell the flat-Earth gang, they’re not going to believe you anyways.