Humans cannot physically dig through the Earth on their own. The Earth's average diameter is about 12,742 kilometers (7,918 miles). The idea of digging through the Earth is impractical due to several reasons:
Depth: The Earth's crust alone averages between 30 to 50 kilometers in thickness, and the entire planet is much thicker.
Temperature: The temperature increases significantly with depth inside the Earth, making it extremely hot near the core to the point that it would be lethal.
Pressure: The pressure inside the Earth also increases with depth, and at the core, it is several million times greater than surface pressure.
Material: The Earth’s layers consist of different types of rock and metal, which are incredibly hard and dense.
Technology: Even with advanced drilling technology, humans have only managed to drill a few kilometers into the Earth's crust, such as the Kola Superdeep Borehole in Russia at approximately 12 kilometers deep.
Length of Time: Even if it were possible to drill through the Earth, the time required to do so would be many lifetimes.
Gravity: While digging down you would not fall through because gravity pulls you towards the center of the Earth, but as you get closer to the core, gravity would decrease.
Resource Intensity: The amount of resources required for such an endeavor would be enormous and not feasible.
Environmental Impact: Such drilling would have significant environmental impacts and risks, including potential damage to the Earth's crust and the release of deep underground gases.
Attempting to tunnel through the Earth is currently beyond human capability and technological limits. It is more practical to explore Earth through other means, such as satellite imagery, geophysical surveys, and scientific drilling projects that aim to understand the Earth's structure and composition.