Su Heng is currently unsure, he is the only one who can produce silver spirit water.

Maybe in the high-end treasure chests in the middle and late stages, someone will give out Silver Spirit Water.

Quickly restore physical strength and improve various states.

There is a huge difference between taking drugs and not taking drugs.

If it is really the only family, how else can others play?

In just a few minutes, the materials were collected.

The other Su Heng did not dare to conclude, but what he was sure of was that Yin Lingshui was more sought-after than medicines on the market today.

Otherwise, the transaction will not be completed so quickly, causing such a great deal of heat in the exchange.

"Through my experience, the improvement of the human body with silver spirit water and special food is generally around 10%."

"Jin Lingshui is much higher, it can reach 25%!"

After careful calculation, Su Heng felt that he had mastered the buff skills and the code of wealth.

"If only I can produce resources like silver spirit water/gold spirit water, wouldn't I just set the price in the future?"

While Su Heng was talking to himself, Yin Yanyan sent a private message.

Yin Yanyan: "Is Brother Xiao Su there?"

Su Heng: "Yes, what's the matter?"

Yin Yanyan: "Brother Xiao Su, I have received the saltpeter you need, but the quantity is very small."

Su Heng had expected that Yin Yanyan would not make much progress.

The raw materials for making gunpowder like sulfur, saltpeter, and nitrate are extremely scarce on the market.

If it wasn't for the ore resource map, even Su Heng wouldn't be able to get it.

Yin Yanyan: "But... when I went out today, I found a few pieces of saltpeter. I don't know if it's the kind you want."

Yin Yanyan: "It has been sent to your mailbox!"

Su Heng took a look at the mail and found that the saltpeter she mailed was several times larger than the one mined from the mine today!

The largest volume is the size of a mobile phone!

Yin Yanyan: "Brother Xiao Su, have you received it?"

Yin Yanyan: "I picked up the big ones on the road, and the small ones I received on exchanges and communication channels."

Su Heng: "I got it, where did you pick it up?"

Yin Yanyan: "It's at the foot of the mountain. I didn't explore it carefully. If Brother Xiao Su is in short supply, I'll try to find out if I can find more saltpeter in the daytime."

Su Heng: "Don't! Enough is enough."

Su Heng quickly reminded her not to go.

Judging from the saltpeter Yin Yanyan picked up, there should be a saltpeter mine near her!

Whether it is size or purity, it is much better than the mine he mined today!

Yin Yanyan: "Ah? Is this enough for Brother Xiao Su?"

Su Heng: "Well, I got it from other channels. Where are you?"

Yin Yanyan: "I told you before, Brother Su, I'm near Wuqu Bay in the 13th living area."

Wuqu Bay...

Su Heng hurriedly looked for Wuquwan on the vein map.

found it!

Wuqu Bay is a full 15 kilometers from Suheng's location. There is indeed a relatively large saltpeter mine nearby, which is marked by heavy red.

A mineral vein like this is usually haunted by high-star alien beasts. If Yin Yanyan really went to explore, there would be no bones left!

Su Heng: "Is the place where you picked up the saltpeter far from your shelter?"

Yin Yanyan: "I put the shelter on the mountain, and the location is not very far. After going down the mountain, I have to walk about 1,000 meters."

Su Heng: "Well, don't go to that location anymore, the farther away, the better."

Yin Yanyan: "Ah? Why?"

Su Heng: "Generally, there will be high-star alien beasts guarding near the mines. If you don't have technological equipment, you are likely to die."

Yin Yanyan: "!! Really?!"

Su Heng: "Well, this information was told to me by an expedition boss. He was seriously injured and suffered a great loss."

Yin Yanyan: "I've been working there for the past two days, and I'm planning to go further!"

Yin Yanyan: "Wow, it's dangerous! Thank you, Brother Xiao Su, for reminding me!"

Yin Yanyan can tell Su Heng which living area she is in and where she is, which means that she trusts Su Heng unreservedly.

In addition, the vein map was originally given to Su Heng by Yin Yanyan, so I have to remind it, otherwise it would be too unhuman.

Closing the dialogue window, Su Heng mailed Yin Yanyan's saltpeter to Li Sike.

The next step is to start expanding his underground shelter.

Su Heng walked to the right side of the shelter, clinging to the wall, and took out the initial safe house model.

【Please select: Above/Underground Safe House】

[Above-ground Safe House: After being placed, it will form a 125㎡ above-ground wooden safe house, (disaster resistance: poor) (development potential: good)]

[Underground safe house: After being placed, an underground safe house with a height of 3m and 80㎡ will be formed (disaster resistance: good) (development potential: poor)]

"Choose an underground shelter!"

"Expansion Mode!"

"Confirm placement!"

Su Heng had two previous experiences, and Su Heng placed the safe house with ease.

After scanning a green code, the wall in front of him disappeared, and another 80m2 initial underground shelter connected to the shelter appeared in front of him.

The layout mirrors that of Su Heng's current underground shelter, and the area of ​​the material storage room and the food processing room has doubled.

There is also a staircase exit at the end.

Su Heng still chose to use the stone upgrade plan and added 240 units of stone to the system.

"Confirm the upgrade!"

The whole room has been scanned by the orange code~lightnovelpub.net~ and the place has changed dramatically!

The original wood disappeared and was replaced by stone materials. The entire house structure has undergone tremendous changes with Su Heng's expansion.

【Su Heng's underground safe house】

Space: 150㎡

Structural strength: 95%

Completeness: 99%

Facilities: wooden table, wooden chair, wooden bed, wardrobe.

Disaster Resilience: Excellent

Evaluation: A medium-sized shelter in the apocalypse, with good lighting and ventilation, strong waterproof and moisture-proof and warm-keeping functions, no risk of landslides, and can accommodate 2 to 8 people. It is your best safe haven.

"Upgrading the wooden safe house to stone will reduce it by 5m2, and this time is no exception."

At the same time, a system reminder sounded in his ears.

【mission completed! 】

[Congratulations for getting: Doomsday Honor 300 points! 】

[Current Doomsday Honor Remaining: 1710 points]

[Congratulations on getting a chance to draw a lottery, do you want to start the lottery? 】

"300 Doomsday Honor?"

"There's still 290 points left, plus the Doomsday Honor Points from the Firearms quest, it should be enough!"

"smoke!"

[The lottery is being drawn, please wait...]

[Congratulations on getting: Antibiotic Syringe*10! 】

"Antibiotics again!"

The antibiotics in Su Heng's hands are close to saturation.

【You have a new email】

Su Heng turned to look at the mailbox.

[mailbox (mail to be received)]

The mail contained 9 snow-disaster grenades, a self-made earthen shotgun, and 7 ammunition.

"Dr. Li finished it so quickly?"