The easiest way is to abandon the beam-slab wooden structure and upgrade it to a reinforced concrete structure.

Su Heng checked the upgrade plan for the safe house.

[Wooden Safe House] has been upgraded to [Reinforced Concrete Safe House]

[Required materials: 0/90 steel plate, 0/45 stone, 0/75 sand, 3212/200000ml water]

[Required Doomsday Honor Points: 210/8000]

"This condition is too difficult."

The previous material is good to say that it should not be difficult to collect water and food after squatting on the exchange for a few days.

It's just that 200L of water is a bit worrying.

Nowadays, no one has to drink. It would be too extravagant to use it to pour reinforced concrete.

If you just sign in, you have to sign in for 80 days.

The cost is too high.

In addition to the reinforced concrete plan, there is also a stone safe house plan above.

[Wooden Safe House] has been upgraded to [Stone Safe House]

[Required material: 0/240 stone]

[Required Doomsday Honor Points: 210/5000]

The materials required for the stone safe house plan are relatively simple and easy to collect. Only 240 units of stone are required.

The construction cost is low, the plasticity is high, and it is easy to design.

However, stone safe houses also have disadvantages.

That is, the self-weight is too large, the specific heat capacity is small, and the structural stability and thermal insulation performance are worse than the concrete frame.

"Just choose this one!"

To change the structural casting of the safe house, for others, that is a big project.

But Su Heng has a system!

As long as you collect all the materials required for the upgrade plan, you can upgrade directly.

There is no need for him to shop stone by stone.

As long as it is upgraded to a stone safe house, the problems such as moisture resistance, water resistance and earthquake resistance will be solved in one hand, and the only things left to consider are ventilation and lighting.

Opening the exchange, Su Heng was about to start collecting stones.

At this time, Yin Yanyan sent a private message.

Yin Yanyan: [Brother Xiao Su, are you awake? ]

Brother Xiao Su?

A bit mushy.

Su Heng: [What's the matter? ]

Yin Yanyan: [Look at the email]

The next second, Su Heng received an email.

It contains 10L of polluted water.

Good guy.

10L!

This is... She stayed up all night and stayed up all night? !

Yin Yanyan: [Have you received it? ]

Su Heng: [Received, wait a moment]

Su Heng took the contaminated water out of the mailbox and poured it into a food processor.

Buzzing.

【Processing completed】

【Get: 5000ml pure water】

[Today's Remaining Times: 4/5]

Pour again.

【Processing completed】

【Get: 5000ml pure water】

[Today's Remaining Times: 3/5]

Su Heng didn't hesitate and mailed the 2500ml she deserved.

Yin Yanyan: [Thank you, Brother Xiao Su! ]

Yin Yanyan: [I'm so sleepy, I'm going to sleep! ]

This girl is working too hard to get pure water.

This can't be done.

Su Heng simply replied "Yes" and closed Yin Yanyan's chat window.

Then, start browsing the exchanges.

【Seller: Su Jiaxin】

[Items on the shelf: 2 wood]

【Intention to trade: 300ml polluted water/150ml pure water】

[Remarks: I chopped up the wood that was only chopped in the morning, I hope I can drink it again, and the kindhearted people will take it! 】

…

【Seller: Wan Kunpeng】

[Items on the shelf: 1 stone]

【Transaction Intention: 100ml Purified Water】

[Remarks: The quality of the stone that was dug for a long time is absolutely good. I just hope that my saliva will change, and the good man will have a safe life! Liars go! 】

…

【Seller: Niu Dongkang】

【Items on the shelf: 100ml pure water】

【Trade Intention: Food】

[Remarks: Anyone who can eat can chat with me privately, no infected meat, liars stay away! 】

Anyone who has food and water in their hands will be targeted by swindlers.

These types of people don't dare to go out to take risks, and they don't have any exchangeable resources, so they can only cheat with all kinds of rhetoric.

Su Heng observed the general market conditions of the exchange. The demand of most people is still water.

However, there is more information on food demand transactions than yesterday.

Huh?

A piece of transaction information caught Su Heng's attention.

This transaction information is different from the transaction posts posted by others, with pictures!

【Seller: Gao Feiyang】

【Items on the shelf: Doomsday Camera】

【Trade Intention: 1kg of any edible food】

[Remarks: [Picture][Picture][Picture], don’t come here, lie to me, you will die tonight! 】

This transaction post with pictures rushed to the front at once, and the number of views soared.

"Fuck me? Why can you post pictures?"

"Is that silly X upstairs? Didn't you see it was a doomsday camera? It comes with a picture-posting function."

"Brother, can I replace the 100g pickled radish?"

"Do you want water? I have 300ml of pure water here."

"Brother, can I change your line with 400g of steamed buns? Enough for you to last for two days."

This transaction post with pictures quickly accumulated a lot of comments.

The three pictures were all taken in front of a mirror. The main function is to display the entry on the shelf of the transaction post.

With the doomsday camera, others can see the entry attributes of the items on the shelves.

This thing is unique in the exchange. The trading posts with pictures are more advanced than the pure text trading posts, and it is easy to get a large amount of traffic exposure.

It's simply a divine artifact!

Soon, Gao Feiyang posted another transaction post.

【Seller: Gao Feiyang】

【Items on the shelf: 600ml pure water】

【Transaction Intention: None】

[Note: Don't be sour, I will never die of thirst! Don't change the water, only change the food, don't comment on the private message for brain damage]

Su Heng clicked on Gao Feiyang's avatar, and UU reading www.uukanshu.com started a private chat.

Su Heng: [Are you there? ]

Gao Feiyang: [in]

Su Heng: [Where did you get the doomsday camera? ]

Gao Feiyang: [Opens a bronze treasure chest]

Su Heng: [Oh, can I replace the 500g cold-eaten rabbit? ]

Gao Feiyang: [What is a cold-eating rabbit? ]

Su Heng: [It's the rabbit meat that is secretly made in a private house]

Gao Feiyang: [It's too low, buddy, someone will give me 900g buns to exchange with me, you increase it a bit]

Su Heng: [Brother, I'm pure meat, I'm definitely more hungry than steamed buns]

Gao Feiyang didn't reply to the message for a few minutes.

It is estimated that he went to reply to other people's messages.

Su Heng decided to add one more size.

Su Heng: [Brother, 800g cold-eaten rabbit, the highest price I can offer, if you don't exchange it, forget it]

Gao Feiyang: [Yes! I will send you a private link again]

Gao Feiyang sent a private link that only the two of them could see.

Su Heng: [Wait a minute, do you want spicy flavor or five flavors? ]

He is not afraid of Gao Feiyang's price hike, the 800g rabbit meat is so refreshing, which shows that his price is far higher than others in Gao Feiyang's heart.

800g of meat and 900g of pasta, of course, choose meat!

Asking Gao Feiyang is also for his sake.

If Su Heng simply stopped buying it, he wouldn't be used to this kind of person.

Gao Feiyang: [Is there any other options? Does that mean that you have at least 1600g of rabbit meat on hand? This is a rich man! ]

Gao Feiyang: [Five flavors, eating spicy food wastes water]

Su Heng successfully exchanged 800g of rabbit meat for the Doomsday camera.

It's a **** profit!