The remaining 500 milliliters of fresh water Chris exchanged for some food and other supplies that might be useful.
For example, one unit of copper, one unit of tungsten, and two kilograms of chicken.
Two kilos of oil and several dry batteries.
And, uh, a head-on flashlight!
These things may not seem important at the moment.
But in the long run, they are important.
As shelters grow, the construction of technological facilities becomes inevitable.
Oil will be the main source of energy in the future.
With the system interface closed, Chris and Max walk out of the shelter.
Although there are still many difficulties in the design of ventilation system.
But he decided to use the time he had now to build a drainage system.
Chris had a detailed plan in mind.
First, a trench is dug above the shelter to allow rainwater to collect into it.
Then the channel is extended to a lowland, where it directs the rainwater to collect.
The work is not very difficult, but it requires a lot of labor.
According to Chris, two days should be just enough time.
Finally, he intends to set aside a day to build the ventilation system and replenish the reserves in the shelter.
At that point, Chris took a spear from the warehouse and cut a line half a centimeter deep on the ground.
The line goes all the way down to the lowlands, which are the key areas of the aqueduct.
It took him only about ten minutes to do it.
Next, just follow the guide of the line and keep digging the drainage ditch.
Chris was waving a shovel in front of him.
Instead of piling the dirt on either side of the ditch, he kept filling the pits around the shelter.
After all, if stacked on either side of a ditch, it acts like a dam that prevents rainwater from flowing into the ditch.
These pits are likely to collect rainwater and eventually seep into underground shelters, so they must be prevented.
Chris and Max are moving fast.
All morning, with little rest, they dug more than a hundred meters of ditches.
But the ditch needed to be dug was so long that Chris's morning effort was less than 20% of the total.
He knew that this work could not be completed overnight, and must be combined with work and rest, so he beckoned Max back to the shelter.
Then the smell of stew filled the room.
For the rest of the day, Chris and Max kept digging.
This repetition is a day and a half.
During this time, they only took one break, and Chris was rewarded with the fourth day's settlement - a full 150 survival points.
Since the previous day's survival points were barely expended, Chris now has a total of 360 survival points.
In his opinion, this is already a small fortune.
It took a day and a half to dig the diversion ditch, faster than the two days he had expected.
Chris was filled with pride as he looked at the long aqueduct.
This is his first big project after he came to this survival game, and it took a day and a half.
However, digging the ditches of the foundation is only half the job.
Because, soil drainage channels are easy to be washed by heavy rain problems.
Such as blockages, cave-ins, or even washed out, these can happen.
The drainage ditch must be completely transformed into stone.
Chris had already prepared the stone he needed.
The plan had already taken shape in his head.
It just needs to be implemented.
Taking more than a thousand units of stone out of storage, Chris laid it out around the ditch.
More than a thousand units of stone piled up like a hill.
Because the stone pile is too high, some have gone beyond the scope of the system's enhanced identification.
Chris had to take it out in batches, dividing a hill into three.
Then he opens the system's enhanced interface.
"Name: Simple drainage ditch."
"Introduction: The drainage ditch dug out of the ground is very simple, poor stability, extremely low safety, and medium water efficiency."
"Can strengthen branch 1: Function enhancement: widen the width and depth of the gutter, so that it can accommodate more water, more stable, drainage efficiency is greatly improved." Cost of Survival Points: 25"
"Can be strengthened branch 2: material strengthening: the overall upgrade of the gutter to stone, make it more solid, immune to the impact of water flow, greatly improve safety, greatly improve drainage efficiency, and greatly improve the service cycle." Cost survival points: 50+ 1000 units of stone."
Although it felt expensive, Chris knew it was a necessary expense and did not hesitate to order the enhanced Branch 2.
In an instant, a thousand units of stone turned into white light and merged into the drainage ditch.
The drainage ditch is wrapped in white light, and although the specific look is not clear, the outline can feel that it is constantly changing.
Soon, the white light disappeared.
Chris had a surprise smile on his face.
The drains, freshly strengthened by the system, are spotless.
Under the sunlight, it reflects the unique white light of the stone.
Chris looked at this reinforced drainage ditch and his joy was beyond words.
At this point, the project that took a day and a half was finally completed!
He took Max back to the shelter, sat down in a wooden chair, and opened the system menu.
But soon, he closed the menu again.
He had planned to reward himself and Max for two days of hard work by trading in some food.
But then he dismissed the idea.
We still have one more day before the acid rain falls.
But plans to renovate the shelter have not been fully completed.
The establishment of the ventilation system is still unclear.
If you reward yourself now, it's a waste of time.
Taking a deep breath, Chris pulled out a pen and paper.
It's a small item from a fresh water trade the other day.
While many people may not think pens and paper will be of great use in the last days, Chris finds them so valuable that they are traded at a very low price.
On paper, Chris drew a profile of his shelter.
His refuge was built on a hillside, a terrain he had deliberately chosen.
To prevent floods and other disasters.
On the profile, Chris marks the newly constructed water channel and marks the location of the skylight.
Then he closed his eyes and thought for a moment.
How do you build a ventilation system?
The ventilation system not only needs to ensure the ventilation effect, but more importantly, can not leak rain.
After a moment of reflection, Chris's eyes lit up.
What if we put a cover on the vent?
As soon as the idea came to him, he sketched it out on paper.
A few minutes later, the prototype of a ventilation system appeared on paper.
According to his vision, ventilation still takes the most primitive method - cutting holes above the shelter.
Drill more holes to ensure air circulation.
After the hole is cut, iron ore is used to create a protective cover in the shape of a small umbrella.
In this way, the water will not flow directly into the hole, but will be directed to the side of the hole.
However, iron may rust under the rain, in order to ensure long-term durability, it is best to use stone materials.
Write down the notes, and Chris continues to think.
Rainwater shielded by a small umbrella will not enter the hole directly, but it may penetrate into the shelter after landing.
After a few moments of reflection, Chris wrote on the page:
Next to the hole, it is also necessary to dig out the channel to collect the rain water to avoid the drain.
That way, no puddles will form in place.
After half an hour of thinking and sketching, Chris finally finished the design sketch.
He stood up and moved his arms and neck, slightly numb from sitting.
Then he came over the shelter.
Using the stone door of the shelter as a location reference, Chris removed the stone shovel from the warehouse, drew four circular marks on the ground, and began to dig.
The ceiling of the shelter is not deep below the surface.
Chris had only dug about thirty centimeters before he hit something hard.
I looked down, and sure enough, there was a gray-white stone board.
This should be the ceiling of the shelter.
At this depth, Chris didn't go any further.
On the one hand, he did not have the tools to cut a hole in the stone slab, on the other hand, he was also worried that his technology was not mature enough to damage the structure of the shelter, and eventually trigger a collapse.
So, after clearing the dirt he had dug up around him, he walked to another marker.
With his first experience, Chris knew that digging deep was enough.
As a result, his movements became more adept.
After several hours of effort, four round holes were dug out.
Chris took a long stretch.
Such a long time of physical labor really made him feel tired.
But this is only preliminary work.
The next step is what matters.
I looked up at the sky. Night was falling, stars were shining, but I could not see the moon.
It's time to wrap up work for the day.
Chris puts the shovel into storage and greets Max.
In the distance, Max ran over with what appeared to be something in his mouth, looking extremely excited.
Looking at it carefully, Chris raised his eyebrows.
Max brought back a chicken!
Max couldn't help with the delicate work in the afternoon, so Chris left him to his own devices.
I never thought Max playing alone could bring such a surprise.
Max came to Chris, opened his mouth and let go of the chicken, wagging his tail in circles and rubbing against Chris's pants.
It seems to take credit and crave praise.
Chris picked up the chicken, which weighed about two pounds, touched Max's head and said approvingly:
"That's great!