Most importantly, although Tang Li and her companions had uprooted the seeds planted by the R-country branch of the Holy Light Organization in Z-country, as well as the Holy Light Organization's Z-country branch itself, the organization's headquarters remained.
In developed countries like M-country and O-country, the Holy Light Organization had even infiltrated the high echelons of society.
In the post-apocalyptic underground cities, the Holy Light Organization stepped out of the shadows and became the absolute rulers of most parts of the world.
The elites who had fled to M-country, O-country, and other countries, despite abandoning their own people, still occupied their nations' resources under the guise of their former ruling states.
Even with the combined elite of the Holy Light Organization numbering only tens of millions, they controlled over 80% of the world's resources.
After consolidating control over other countries, the Holy Light Organization began to cast its covetous gaze upon Z-country.
Even though Z-country had provided them with the information that allowed them to survive in the first place, and the technology for the underground cities they inhabited, they disregarded all of it.
Their sole aim was to unify the world!
Fortunately, they were unaware that Tang Li could alter memories through invasive brain-computer interfaces.
Due to a lack of sufficient mental enhancement drugs, while they eventually mastered quantum communication technology, fighter mechs, and infinite brain-controlled robots, and also acquired Z-country's non-invasive brain-computer interface technology, they could only remotely control fighter mechs and infinite brain-controlled robots through quantum communication via invasive brain-computer interfaces.
They then used resources from around the world to manufacture a sufficient number of fighter mechs and infinite brain-controlled robots.
With Z-country's resources needed for constructing underground and underwater cities capable of housing billions of people, and the connecting passages between them, there was insufficient capacity to produce a large number of fighter mechs and infinite brain-controlled robots.
During the great plague in the third year of the apocalypse, Z-country, due to its higher population density compared to the second life, also suffered a higher mortality rate.
After the great plague subsided, the Holy Light Organization launched a war against Z-country.
Fortunately, Tang Li's replication space could replicate finished fighter mechs and infinite brain-controlled robots as long as it had sufficient spatial energy, even without adequate mineral resources.
The corpses of those who died in the great plague provided a vast amount of energy to Tang Li's space.
The vacated underground cities, after the massive death toll, could also be salvaged as scrap by Tang Li, converting into spatial energy to replicate fighter mechs and infinite brain-controlled robots.
Even decommissioned fighter mechs and infinite brain-controlled robots from the battlefield could be salvaged by Tang Li and then replicated as functional units.
This granted Z-country an unlimited troop reinforcement cheat.
Ultimately, employing a human wave tactic, they repelled the Holy Light Organization.
With every Holy Light Organization underground or underwater city conquered, Tang Li personally intervened, using the invasive brain-computer interfaces on their heads to alter the memories of Holy Light Organization members and those subjugated by them.
This was how they ultimately won the war.
Despite Z-country's eventual victory, the casualties were severe, and much was wasted.
The Earth was also further ravaged.
The war consumed a vast amount of Z-country's energy, slowing its development.
Post-war, remnants of the Holy Light Organization continued their destructive acts.
In the end, humanity's development even lagged behind that of the second life.
This was why Tang Li stated that in this life, she could not reveal information about the apocalypse prematurely as she had in the previous life, causing global panic. Underground and underwater cities needed to be built stealthily, and even other countries in the world had to disappear.
This was to prevent humanity from falling into internal conflict and to allow them to survive better.
"Of course, the apocalypse doesn't need to be revealed in advance, but the official channels must be prepared for the natural disasters in the six years leading up to it. I believe Elder Xue and the others will make arrangements for this."
Hearing Tang Li's words, everyone found them quite reasonable.
Peng Yixuan asked, "Sister Tang Li, how should we stealthily build these underground and underwater cities?"