Entertaining Mo Qingyan and Ding Ning to have a meal in their own shelter, Chen Xincai sent the two of them away.

And after the two left, Chen Xin's shelter was quiet again.

After powering on the freezer and debugging it to confirm that it was starting to work, Chen Xin put the vegetables he had harvested before and refrigerated them at low temperature to ensure that they would not spoil.

In addition to vegetables, the canned luncheon meat and canned pork exchanged from Mo Qingyan were also put in the storage room by Chen Xin, but the box of wine was moved to his bedroom by him, and after opening a bottle and putting it in the bedside table, the rest was stuffed under the bed.

Although he usually doesn't drink heavily, in the current apocalypse, a drink before going to bed can soothe the nerves and make him sleep more soundly, so Chen Xin deliberately asked Mo Qingyan for a case of wine this time.

And more importantly, these things will become extremely rare with the arrival of the end times, after all, wine production needs food, when people can't eat enough, but there is no extra food to use to make wine.

These pre-apocalyptic wines can also become a rare and valuable resource, and will become more valuable as the apocalypse lasts.

However, Chen Xin did not have the idea of hoarding wine as a material, on the one hand, he only had to continue to upgrade the shelter with the system in hand, and when the planting greenhouse had enough output, it was not difficult to make wine, and there was no need to hoard it.

On the other hand, it will take a long time to wait until the wine becomes very valuable, and such a long time is enough for Chen Xin to have the ability to make wine, and expand the planting greenhouse so that the grain production can support him to make wine.

Of course, some of the treasures in Mo Qingyan's wine cellar are still very tempting for Chen Xin, maybe he can find her to exchange some good wine in the future?

Chen Xin had this thought in his mind, and he couldn't help but think about this matter, but he didn't think much about it, this matter was not something that he needed to worry about for a while.

Among the materials exchanged from Mo Qingyan today, what really made Chen Xin feel that he should hoard was canned pork.

When the end of the world comes, the original food output of human beings has basically been reimbursed, and the raising of poultry and livestock will naturally be impossible, and meat resources will become very rare, even surpassing wine to some extent.

After all, wine can also be rebrewed by growing grain in greenhouses, but pork and beef are ......

Even if the state had built underground farms before the end of the world, these things were destined to become a luxury on the table of a very small number of people, and would not flow into ordinary shelters, as they were before the end of the world, something that everyone could enjoy.

Although the state did have a plan for what food the shelter would rely on after the end of the world before the end of the world, the taste of mushrooms and rat meat ...... No one would think that these things can be the same as pork and beef.

Of course, with these, you may be able to look forward to the taste of synthetic artificial meat?

After all, there will be a market for demand, and artificial meat may become popular in the near future, and the improvement of taste to make it taste more like meat should become a rigid demand.

However, for Chen Xin, it allows him to look forward to whether the planting greenhouse will have the function of animal breeding after the upgrade.

If he can obtain the function of animal breeding, then perhaps Chen Xin can obtain a stable source of meat.

Although people cannot die without eating meat, malnutrition is not the only state of survival in the last days, and the intake of animal protein from meat is a necessary factor to maintain human health and balanced nutrition.

Although it is not easy to fill one's stomach in the last days, it is obviously possible to greatly improve the quality of life of people in the last days.

It's just that there is a question here that still makes Chen Xin feel a little troubled, that is, where to find the animal's mother.

The system upgrade may allow the Vault to have the ability to raise animals, but Chen Xin's system function is only one upgrade, and he is not sure if he can randomly attach a few live animals after upgrading the Vault to obtain the ability to raise animals.

If he had to do it himself, it would not be easy to see a live animal in this environment.

But maybe there will be animals in the Great Vault? Among other things, rats and earthworms are two of the three important food sources prepared by the state for the end times before the end of the world, and they are planned to provide valuable food for the survival of humans in the last days together with mushrooms.

Just eat rats and earthworms...... This inevitably made Chen Xin, who had not yet entered the state of having something to eat in the last days, feel a little uncomfortable.

Although rat meat is actually a kind of meat that is a bit of a curiosity but a serious ingredient before the end of the world, as long as the hygienic environment can be controlled, rat meat can indeed be regarded as a good source of animal protein in the last days.

As for earthworms, no one really ate this thing before the end of the world, but in "The Wandering Earth", the earth was frozen and after humans went underground to live, the main food source was edible earthworms, which made the concept of earthworms edible to be understood.

The current environment of Blue Star is also different from the environment in "The Wandering Earth", after all, everyone is facing similar environmental problems, but the current Blue Star is not as extreme as the Wandering Earth, and the current human beings have not lived in the underground city thousands of meters below the planetary engine.

These gaps are of course due to the technological generation gap between movies and reality, after all, for real humans, digging a hole thousands of meters deep is almost the same, but if you want to dig a dungeon thousands of meters deep......

This is beyond the limits of what humans can do with current technology, and humans don't really need to dig that deep.

In "The Wandering Earth", it is because there is a practical need to dig such a deep dungeon, and in reality, human beings want to escape the extreme cold in the apocalyptic weather, although digging deep enough to heat with the help of ground temperature is a very good practice, but the existing technology still restricts us from doing so, and it is really unnecessary.

Although the existing technology of human beings can build dungeons, for example, the city of Montreal in the Maple Leaf Country has a 17-kilometer-long dungeon, which was built only in the middle of the 20th century, more than half a century ago.

But the depth of this dungeon is only the depth of the underground building under normal circumstances, that is, the depth equivalent to the current underground pedestrian passage or pedestrian street, and it is not exaggerated to the depth of five thousand meters below the surface of the earth in "The Wandering Earth".

In fact, it would be almost impossible for humans to construct at this depth under normal circumstances.

And although the underground city of Montreal is not deep, it can withstand the long winter of minus 30 degrees Celsius for four or five months every year.