Tang Zong had to move the materials he packed up again, and all the packed boxes were reopened, whether the earth was permanently missing or temporarily missing, he had to live on this barren planet first.

Live alone.

This is also the training that Tang Yue received at the beginning: when he is in a desperate situation and loses contact, he insists on surviving and sticking to help!

"Check the oxygen and fresh water first." The old cat instructed, "Then count the food, medicine, electricity, fuel, energy, redundant spare parts, ......"

"Mr. Tang Yue! Mr. Tang Yue! Mai Dong shouted eagerly in the channel, "I...... Will I be able to land? To your side? ”

Tang Yue glanced at the old cat.

The old cat slowly fell silent.

.

.

.

Tang Yue and the old cat both knew this.

Mai Dong could not land.

At present, the only lander stands on the sand outside Kunlun Station, and this lander is called the "Eagle" spacecraft by Tang Yue.

The "Eagle" spacecraft is the only vehicle in Tang Yue's possession that has the ability to break away from the gravity of Mars and enter orbit to dock with the United Space Station.

If nothing else, after Tang Yue has completed all the work, he will leave Kunlun Station on this lander, go to the United Space Station, and then return to Earth on the Orion 2 spacecraft.

But this thing is a one-off, it is divided into two parts: the upper upgrade and the lower stage, and the only one that really leaves Mars is the upper upgrade - that is, the upper half of the lander, and the lower half will remain on the surface of Mars.

The upgrade of the lander is responsible for sending Tang Yue to the United Space Station, which is its only function and mission, after the mission is completed, it will be abandoned, and there is no ability to re-enter the atmosphere, that is, Tang Yue has the ability to enter the United Space Station again, but he will never be able to come down again.

There wasn't even a lander on Maidong's space station, and the next one was supposed to be brought by the Orion spacecraft two years later, but now that Earth is gone, the next expedition to Mars will never be able to set off.

There is an Orion-2 spacecraft on the space station, but Orion is just a space ferry, responsible for going back and forth between Earth and Mars, and when it enters the atmosphere, it will immediately disintegrate and burn to slag.

"I see."

The girl's expression slowly dimmed.

She could only stay on the space station.

Fate played a cruel joke, they were clearly the last two people in the world, fortunately escaped the catastrophe, but they could not be crossed by a short distance of 400 kilometers.

On the cosmic scale, which is often measured in light years and astronomical units, compared with the distance between earth and fire of 55 million kilometers, this insignificant 400 kilometers is really negligible, as thin as the layer of glass on the computer monitor, as if Tang Yue could touch the other party by piercing this layer of glass.

If someone drew a map of the solar system, then on the map, Tang Yue and Mai Dong were simply close together, and they couldn't even fill a single pixel.

But for a person who is 1.7 meters long, 400 kilometers is still too far, so far that they can never see each other for a lifetime.

The difference of a millimeter is the moat.

"Girl, don't be discouraged yet, let's think of a way." The old cat comforted her, "There is a saying, stay in the green mountains, don't be afraid of no firewood, as long as people are safe and sound, you can definitely find a way...... There is no endless road. ”

"Yes, yes, Miss Mai Dong, we will definitely find a way to take you next!" Tang Yue nodded, "You have to believe us!" I have an old cat here, and an old cat is an expert! It will have a way! Isn't that an old cat? ”

The old cat was stunned.

Tang Yue kicked the old cat where Mai Dong couldn't see.

The old cat nodded hurriedly, "Yes, yes, yes, I will definitely think of a way!" ”

Mai Dong bit his lip and nodded.

Tang Yue was really worried that this girl wouldn't be able to think of doing something stupid for a while.

He himself is very arrogant and heartless, but other little girls don't necessarily have such big nerves as him.

After all, the disappearance of the earth is such a big blow, and most people will have a mental breakdown.

"You all have to take stock of all the necessities of life now, oxygen, electricity, food, fresh water, medicines, and spare parts." The old cat urged, "Remember to be careful, don't miss anything." ”

Tang Yue began to count the supplies.

When he cleaned up Kunlun Station, he had already sorted out the place, and everything was packed and put away in different categories.

It's just that when he packed the box at that time, he didn't think that he would have to live on these things, he only felt that he was cleaning up the mess for the expedition team, and his mind was full of rushing back to Earth.

Now these boxes are all Tang Yue's belongings, directly determining how long he can survive.

The first is oxygen.

Oxygen is the most terrible, and a lack of oxygen can kill Tang Yue in three minutes.

There are two life support systems in Kunlun Station.

One is a commonly used regenerative oxygen production system, which uses electrolysis of water to produce oxygen, as long as there is electricity and water source, the system will continuously produce oxygen.

Normally, the oxygen in the Kunlun station is supplied by this system.

The official name of this thing is "Oxygen Generation System", and the abbreviation is "OGS".

The exterior looks like a refrigerator or air conditioner, but it is a white cabinet standing in the corner, with a high degree of integration.

I think the OGS system on the US Space Shuttle was a behemoth of several hundred kilograms.

Although it may not look very conspicuous, the OGS cabinet is the core of Kunlun Station's life support, and it is also the most complex part, and if it goes wrong, Tang Yue will not live for more than five minutes.

The other is a non-renewable oxygen production system used in emergency situations, which uses solid perchlorate for oxygen production.

However, perchlorate is a consumable, and if you use a little less, you can't replenish it, so it won't be activated in non-emergency situations, and it's usually kept in a first-aid kit.

Tang Yue opened the lid of the OGS cabinet, the green indicator showed that everything was working normally, and there was a slight humming sound inside the cabinet, which was the sound of electrolyzed water.

"How long will this thing work?" Tang Yue asked, "Is my lifespan the same as it?" If it hangs, I'll die, right? ”

The old cat shook his head.

"Not necessarily, you don't necessarily live as long as it does." "The design life of the OGS is 15 years, and this system was replaced last year, and it has at least 10 years of life...... But you don't necessarily live past 10 years. ”

"Don't worry, I'll take it with me before I die."

Tang Yue spread the maintenance manual in his hand, his eyes swept the buttons and indicators on the control panel, the OGS cabinet can produce up to 5 kilograms of oxygen per day, and provide enough oxygen for six people at the same time, now Tang Yue is the only one left in Kunlun Station, he turned down the power of the cabinet.

When the earth was still there, Tang Yue held the idea of not using it in vain, and used OGS as an air conditioner to blow, and now that he thinks about it, he really wanted to strangle himself at that time.

He also wants to live a little longer, so try to reduce the power as much as possible to prolong the life of the OGS.

"When one person uses it, 0.8 kilograms of oxygen per day are enough." The old cat said.

Tang Yue lowered the power by more than half.

"How long can this thing last when it is running at low power?"

The old cat did the math.

"If nothing else, with a sufficient supply of electricity, there is no problem in dying in the future...... Fifteen years. ”