Tunneling through the Earth and reaching its center is not a practical or realistic endeavor due to the extreme heat, pressure, and material properties encountered. The Earth's core is extremely dense and hot, making it challenging and dangerous to study directly.

Determining the Earth's center is not based solely on tunneling but involves scientific methods such as seismic waves and geophysical data. Scientists analyze the behavior of seismic waves as they travel through the Earth's layers, including the core. By studying the speed and patterns of these waves, they can infer the Earth's internal structure and calculate the distance to the center.

The study of Earth's interior, including determining the center, is an ongoing scientific field that relies on indirect measurements, modeling, and geological knowledge rather than direct physical access.