CorePiercer

Because of the increase in solar radiation, the surface of the earth will soon be unable to sustain life, and people will need to move to the ground in the future. Therefore, scientists have developed high-tech trains that can shuttle underground efficiently. It is also necessary for the first batch of people's association leaders to conduct experiments to explore the center of the earth and learn how to survive underground.
Some feature list as follows:

1. Easy mining with high efficient miner trains.
2. There is unlimited depth and distance you can travel.
3. To build and upgrade your train to explore deeper.