The South Pole.
As the only two special locations on Earth, the South Pole was covered in darkness for half a year without daytime.
This was the polar night.
It was June, and Antarctica happened to be experiencing winter as well as the polar night.
When Ling Jiu and the others rushed to the South Pole, they saw an abandoned scientific research station.
"Before 2020, there were many such scientific research stations in Antarctica, but 20 years later, almost all of the research stations were abandoned."
Niu Ben looked at the snow-covered research station and slowly said, "In the end, humanity's top echelon discovered a wormhole that led to Mars in Antarctica and built the Antarctic Ice City. The Ice City is also the only building in use in Antarctica."
"Look over there!" A cadet pointed in a certain direction and exclaimed.
As everyone looked over, they saw a cave behind the research station.