Three upgrade options in a row made Su Wu's eyes shine.
Needless to say, the diesel version was probably similar to the ordinary micro excavators sold on the market, but it was cheap.
Only two survival points and a few thousand yuan worth of second-hand items were needed to exchange for a brand-new micro excavator with a market value of more than one million yuan. If used well, this was a ladder that could allow Su Wu to become a rich man.
The only pity was that in the context of the coming apocalypse, the so-called rich were not so attractive in terms of gold content.
"Don't be impatient."
"Now the currency is almost a voucher, and there is no use for more."
"If it is barter, the value is there anyway, and it can be exchanged at any time."
Su Wu restrained his impulse and turned his attention to the other two options.
Compared with the diesel version, the battery version and the unmanned version were more in line with his current needs.
He couldn't get extra diesel, but after putting a geothermal generator into operation, there was no possibility of a shortage of electricity.
As for the unmanned version, it was actually a comprehensive function package. It included battery power, unmanned driving, and automatic construction.
The newly added unmanned driving and automatic construction were also very important to Su Wu.
After all, Su Wu was alone.
At the same time, due to cost and confidentiality considerations, workers could not be hired to dig underground shelters.
The appearance of the unmanned version was equivalent to solving his urgent needs.
"Upgrade to the unmanned version."
Su Wu did not hesitate too much. The full 29 survival points obtained yesterday made him full of confidence at this time, and he also had the ability to be a little extravagant.
After an instant upgrade,
a mini excavator without a driver's seat, with a crawler and chassis length of no more than 1.5 meters and a sci-fi appearance, appeared in front of Su Wu.
Su Wu took a closer look. He found that his laptop could be wirelessly connected to the onboard computer of the mini excavator. Then, through the laptop, he could directly give instructions to the mini excavator remotely and arrange work tasks.
"Total weight: 1.5 tons."
"When running at full power, it consumes two degrees of electricity per hour."
"The onboard battery capacity is 40 degrees, and the maximum charging time is 2 hours."
"The data is not bad. Compared with the products on the market, it should be considered to have been upgraded for at least half a generation."
There was no rush to start the micro excavator.
Su Wu first checked its basic data through the prompts of the Doomsday Survival System.
He found that both the battery capacity and the charging speed were more than double the batteries of the same specifications on the market.
This was not an amazing black technology, but the technical level was advanced enough to be barely worthy of its upgrade cost, which was three times that of the diesel version.
If the social environment were stable, just through the reverse research of this onboard battery, perhaps he could become a regional-level tycoon.
Unfortunately—
after tinkering for a while and satisfying his curiosity, Su Wu ran back to the bedroom and connected the micro excavator to his laptop.
Then he called up the shelter design drawings found in the second-hand trading market.
He transmitted them to the onboard computer of the micro excavator.
After more than ten seconds of data matching,
the onboard computer sent back a successful match prompt.
Then the mini excavator in the yard started its engine and excavated the soil on the spot according to the plan on the design drawing.
At the same time,
on the screen of Su Wu's laptop, a virtual underground shelter structure diagram was displayed.
It also included the outline of the farmyard on the surface, the geological conditions underground, and the location of the excavator.
Even the stage of the project and the estimated remaining excavation time were clearly marked.
It was both detailed and clear.
"This degree of automation is so strong."
Su Wu found that he seemed to have no room for intervention.
For a moment, he had the illusion that he was playing a game.
He turned his head and looked down through the bedroom window at the mini excavator, which was slowly digging a downward slope on the flat ground in the yard. After a long while, he came back to his senses.
Now was not the time to waste time.
He got up and walked downstairs to the yard.
Su Wu strolled around the place where the mini excavator was working.
He pointed at the position.
He picked up an electric hammer and smashed it against the wall of the yard.
The farmyard where he was located was in the suburbs. The main entrance of the yard was close to the highway, and behind it was a deserted rocky beach.
The area was not big, but it was not small either.
If he went out from the main entrance and around to the rocky beach at the back, he needed to travel a long distance.
For this reason,
Su Wu planned to open up a new exit on a wall near the rocky beach at the back for the transport trucks to pass when dumping soil and rocks in the future.
This was one of the few places where he could help in the process of building the shelter.
But the plan was very good.
In actual implementation, there was a little deviation.
This seemingly simple job was extremely physically demanding.
When Su Wu was out of breath and had barely managed to smash a gap two or three meters wide in the courtyard wall, three hours had already passed.
At this time, Su Wu was so tired that he almost didn't have the strength to lift the electric hammer.
"I will never do this again next time."
Su Wu felt a little regretful in his heart. He had underestimated the intensity of the labor.
He leaned against the wall to rest for a while. He wiped his sweat and drank a can of Coke to rehydrate. Then he simply cleaned up the ground.
Returning to the yard,
the engineering robot in the yard was almost done with the micro transport vehicle.
Su Wu simply waited there. As soon as the engineering robot was completed, he spent five survival points to upgrade it.
The upgraded micro transport vehicle looked like a large toy.
The whole vehicle was less than two meters long.
Because it was unmanned, there was no cockpit on it. It was just a crawler chassis and a truck bucket that could carry up to two or three cubic meters of earth and stone.
[Maximum driving speed: 20 kilometers per hour.]
[Load-bearing capacity: 5 tons.]
[Onboard battery capacity: 40 degrees.]
[Maximum continuous operation: 40 hours.]
As a transport vehicle, its speed was pitifully low, between a tool and a large toy.
However, Su Wu was quite satisfied with it.
He had specifically arranged for the engineering robot to make a crawler chassis, and he did not pursue speed. As long as it could drive smoothly on mud and piles of rocks and complete the short-distance transportation of soil and rocks, it was enough.
As for the load, perhaps because the crawler chassis was relatively strong and the engine power was sufficient,
its upper limit of load-bearing capacity reached 5 tons.
Even if the bucket was filled with rocks, it could drive normally without pressure.
As far as the project of building a shelter was concerned, this transport vehicle had almost no shortcomings.
Without hesitation,
Su Wu quickly incorporated this freshly baked transport vehicle into the engineering team.
Then,
with the sound of the metal bearings on the micro transport vehicle turning,
it began to slowly drive toward the construction site.
With the help of a mini excavator, the dirt and gravel that had already piled up into a small hill in the yard were transported and dumped onto the rocky beach outside the yard.