When Luo Yuan was 1,500 meters underground. He could not be sure if the spirits were close by or 30 meters away from him. It was impossible to get the accurate coordinates to where Luo Yuan had to estimate them himself. He got out of the Space-Time bubble and suddenly a four-meter wide burrow appeared.
As it was deep in the ground and near the Earth’s core, the nuclear winter did not affect the environment underground. The temperature here was about 40 degree Celsius which was similar to the temperature before the disaster happened. Perhaps it was the reason the clones had been staying here.