The 3rd layer of fencing is the Ice Wall, blocking humans from contacting their alien kin.
Denying humans access to the interstellar technology and cosmic laws possessed by their ancestors

The 3rd level of the fence is the hunting art-IceWall:
Dozens of countries controlled by the X-Dark Forces forbid humans to cross the IceWall

Humanity's Response:
Organize walks over the Antarctic IceWall to inspire brave explorers.
Inspire human curiosity about the Antarctic IceWall.