Decisively placed the origin in the slot of the military advisor, so there were only 30 free political points left in Xia's hands.

But it's all worth it, increasing the lethality of the robot, that is, increasing the combat effectiveness of the origin in disguise, it is not an exaggeration to say that the combat effectiveness of the old summer side has increased by at least five percent.

What a celebration to make!

"Soxia, where are we going next?"

Checking the gear he was carrying, Origin asked.

"Let's go to the shelter where I used to stay, and you will also go there to install the solar power generation device first, and then we will not be in the underground facility, and it will be difficult to get other types of energy supplements."

When Origin left his hut, he had already brought the solar charging device that he had replaced before, so he didn't have to worry about not being able to recharge even on the surface without a power generator.

In addition, the energy batteries that have been found in underground facilities one after another in the summer will be installed in the shelter when the time comes, which can fully cover the demand for electricity from the source.

"Understood, please lead the way."

The origin nodded very humanely in understanding.

Gu Xia is naturally happy to go back as soon as possible, but Gu Xia has not actually been to this place, so he doesn't know the way back.

Fortunately, there is a decision in the system called [Mapping], which only costs 10 political points to get a rough map of the nearby area, of course, it is only a map of surface buildings, roads, spheres of influence, and strongholds, and things underground are not in the service range.

Decisively clicked the button to open the decision, a map that is not very accurate, but enough for directions appeared in the interface of the system, and also intimately marked the current location of the old summer and the location of the shelter, and even marked as the origin.

It's almost like opening half of the map, and being able to grasp the movements of your own units within the map, even if you can't see the direction of the other faction's actions, is already a great help.

"Let's go."

Therefore, Xia greeted him and walked on the way home with the origin.

But when Gu Xia continued to check the icon on the map, he found that Su Qianxue did not exist on the map.

Could it be that Su Qianxue was not marked on the map because she did not become a comrade-in-arms in the same camp as herself?

After all, it's night, as long as Su Qianxue leaves the underground facility and can't find herself, there is a high probability that she will return to the shelter.

At least that's what Gu Xia thought.

Of course, there is also a certain possibility that Su Qianxue is still underground and has not returned to the surface.

As for the assumption that Su Qianxue had died in the underground facility, Xia hadn't thought about it at all, after all, Su Qianxue didn't think like someone who would risk his life, and it was obvious that he knew the situation inside before going to the underground world.

Otherwise, she wouldn't have spent money on the Dominion to get a lot of weapons and ammunition.

Putting this aside for the time being, Xia turned his attention to the scientific research options on the system interface.

Compared with the semi-draw-on scientific research system in the stars, the scientific research system of the tightrope is much more conscientious, and belongs to the kind that puts things in front of you, tells you the follow-up results and routes, and lets you choose by yourself.

However, the reality is definitely different from the game, and there are some changes to the research projects in the system.

The most obvious is that behind the scientific research options that have been revealed, there is a prompt that reads, "The follow-up scientific research route is found in the exploration", which makes people feel that there are infinite possibilities but they hate a toothache.

660 scientific research points is not much, there are many scientific research projects that cannot be completed by these alone, and the traditional start of the old three, plus the research speed, plus the upper limit of production efficiency, and the speed of processing plant construction are not considered in the scope of the old summer.

After all, the most important thing now is to transform technology into combat effectiveness or productivity, rather than looking to the future.

Therefore, Xia directly chose a project called "Civil Factory Reform I.".

[Project: Civil Factory Reform I.]

[Project introduction: The development of productivity requires the continuous progress of science and technology, and now our achievements in some technologies can be applied to production, so the reform of the factory is an urgent thing, so that the light of science and technology shines on us!] 】

[Cost: 500 research points]

[Effect: 1. Increase the productivity of civilian factories by 20% 2. Reduce the production cost of civilian products by 10%]

The effect of this project is not very strong at present, because Gu Xia only has a civilian factory on hand, and even if it is completed, it will be able to produce a few more canned potatoes a day.

But the price of food in the wasteland is high, especially this kind of well-made canned potatoes, as long as the old Xia Ken sells it, there must be a lot of money.

And it's a shame to say that this is indeed the scientific research option that can provide the most benefits for Gu Xia at present.

……

At night, the surface of the earth is much cooler than when there is sun, and similar to deserts, the low water vapor content in the air causes the temperature difference between day and night to increase sharply.

After a night's trek, Xia finally returned to the place where the shelter was located.

Knocking lightly on the door, Xia didn't hear the reaction inside.

"Su Qianxue, are you there? I am back! ”

But no matter how Gu Xia called, there was still no response.

There was no way, so Xia had to try to see if he could open the door.

What Gu Xia didn't expect was that the door of the shelter was not locked, and it was directly opened by himself.

Suspiciously, he glanced at Origin, and Xia led him into the door.

There was no shadow of Su Qianxue in the shelter at all, and it stands to reason that Su Qianxue should not have set off to collect supplies at such an early stage.

And the pots and pans used to cook food in the shelter seemed to have been useless for a few days, and there were no more droplets of water on them, replaced by a thin layer of dust.

"So Xia, here's a letter."

Origin picked up a piece of paper from his desk and called out to Gu Xia, who was still looking.

Gu Xia took a look, whether the words on it were written by Su Qianxue is not clear to Gu Xia, after all, I haven't seen it before, but the words are known, it seems that when God sent him over, he directly sent him to a place with the same language as himself.

The letter was very short, but Gu Xia read it for a long time.

Because of what was written on it, it was a little difficult for Gu Xia to accept.

"So Xia, I don't know if you'll see this letter, and I don't even know if you're still alive. Sorry for leaving you there alone at that time, I went to look for you but didn't find you.

I was going to be here waiting for you to come back, but I had something to do, so I had to leave.

If you're still alive, if you've seen this letter, it means I'm already on my way to Migration City 109, or I've arrived, and this sanctuary is left for you, and the contents are all handed over to you.

If we meet again in the future, then ......"