Bai Yan is 13 years old.

No. 77 is the serial number of her sister "White Feather", who died a month ago, into the hole.

The frequency of hole-in-the-hole is once a week.

Last week, Bai Yan was attacked by an unknown creature while entering the cave and bit her ankle, and in the memory screen, countless huge black shadows flashed in the mist.

Bai Yan didn't even see what it was, she just rushed to the entrance of the cave with instinct, and escaped a second before it closed.

Gu Qiao couldn't judge the original appearance of the unknown creature from the quick picture shadows.

Like a large python, but not in the same way...... Moreover, the way the big snakes hunt is to strangle, and they will not directly attack and bite.

Regarding the background of this dungeon world, what is obtained from Bai Yan's memory is still one-sided.

Bai Yan was born in a dungeon where supplies were extremely scarce.

In her cognition, they live underground, and they are a human survival base built at a depth of 1,000 meters underground to resist the high concentration of fog on the ground that is not suitable for survival, and the harsh environment caused by nuclear radiation pollution.

Sick, hungry, and dead, most of the people who live in this world do not live long, but only have a short and sloppy life.

And the hardest to survive are women.

The population of the dungeon has plummeted, and school-age women must bear the demographic crisis and keep having children to make up for the massive population shortage.

Soon, the dungeon no longer retains the institution of human marriage, and women are forced to marry multiple people, and the next generation is guaranteed as soon as possible.

They are even forced to undergo genetic modification and artificially "urge injections", and most women only have a short life of 30 years, dark dungeons, and survive in this way.

Newborns are fragile, and after birth, they are brought to the ground to be "baptized" after breastfeeding, in order to adapt them to the environment of the ground, in the hope that one day humans can live on the ground again.

This also leads to a lower survival rate, and the drawbacks of forcibly modifying genes, even if they survive, most of them can only maintain a life span of less than 35 years old, and they will grow up quickly and age quickly.

Because of the risks associated with childbirth, women have increased the severity of their survival, and they have to start giving birth in a short life when they are still ignorant, and when they get through that period, they have already aged rapidly and can only wait to die.

They have no choice, and under the extreme scarcity of materials, in order to survive, in order to eat three meals a day, they have to passively bear such a cruel fate.

Even, during pregnancy, it may be the only time they can eat half-full.

But even if the world is so difficult, there are always people who are unwilling to such a fate, Bai Yan's sister Bai Yu is like this.

When she was sixteen years old, after the death of two children in a row, she was unwilling to continue to let a little life be born in such a cruel world.

She began to look for a way to break the game.

Three years ago, for some unknown reason, mysterious portals that appeared regularly or randomly on the surface connected different places where they could gather supplies, mine stones, or hunt animals, or large tracts of clean water...... There are abundant resources, but they are also fraught with danger.

At first, only men were allowed to enter.

Bai Yan's sister, who can be regarded as a pioneer, blended into the team in disguise, followed to the ground, and entered the cave.

Several times in a row, because of her carefulness, she harvested quite precious herbs.

After her identity was discovered, the benefits she brought gave the captain of the team a new idea...... Soon after that, all the teams that entered the cave began to select suitable women to follow the hole.

After women joined the team, they brought unexpected results, perhaps because they had been suppressed for too long, and they were reluctant to return to the old life, even if there were more women who died in the hole, they were willing to seek a turnaround in their lives in this way.

Entering the cave is the hope of survival, and it also coexists with destruction.

All newly opened holes on the ground will be taken over by a special escort team, and in Bai Yan's memory, these people are to protect the safety of the residents of the dungeon and maintain law and order.

But after Gu Qiao squatted in the crowd, he asked Eva to test the current environment, although the pollution was indeed not light, it was not as terrifying as Bai Yan had in her cognition.

What stays on the ground for more than three days will rot and die..... Sounds more like a word of intimidation, to prevent the dungeon's dwellers from going up to the surface without permission.

As for these escorts, do they really care about the safety of this car?