"...... It actually exploded......"

The old cat sat in a chair with a dirty face.

"Don't move." Tang Yue held its cat's head, took off a broken beard stuck to its cheek, and then helped it straighten out its unkempt and burnt cat hair.

"I ...... My beard ......"

The old cat was in tears.

"How did you do that? Forgot the explosive limits of methane? Tang Yue asked.

"I was careless about this...... There was a problem with the flow rate of the propellant and liquid oxygen, which caused the oxygen not to burn out completely, so there was residual oxygen in the pit, and by the time I climbed into the rover and opened the pressure relief valve and came down, the methane gas concentration in the pit had exceeded five percent. The old cat shook his head, "So it's going to blow up at one point." ”

Tang Yue patted the old cat's shoulder and asked it to mourn and change, it was not a real cat after all, and its beard was broken and could not be restored.

The old cat is really rare Its few beards, and he has to comb and maintain them every morning, and Tang Yue has also seen the old cat carrying him behind his back and secretly gluing its broken beard with 502.

It's a pity that it failed.

This small explosion temporarily interrupted their work to make fresh water, the two layers of plastic film and the sink were blown away, the plastic film was useless, it shattered into strips like a broken balloon, Tang Yue had to replace the new film, the plexiglass sink was very strong, no big problem, and it could be used again.

Tang Yue and the old cat learned a lesson, and two people must be present when making fresh water in the future.

Otherwise, the methane mixes with the oxygen inside the pit and can easily reach the explosion limit.

Tang Yue took a biscuit in his mouth and brought the large sink on the floor to the table, there were about ten liters of fresh water here, because it was condensation, so there were almost no impurities in the water. This is the result of their work this morning, after 99 days on Mars, Tang Yue has a new fresh water replenishment for the first time.

"Mai Dong, the water has fallen, what should I do next?" Tang Yue asked, "Do you want to dig outside?" ”

The girl, dressed in blue overalls, appears on the screen, "Have you already taken care of the fresh water?" ”

Tang Yue pointed to the sink on the table.

Mai Dong was pleasantly surprised, "It's really Mr. Cat." ”

"What Mr. Cat?" Tang Yue's old face pulled, "This is my credit, okay?" Your Mr. Cat almost blew up the condenser. ”

"Okay, okay, Tang Yue, your credit." Mai Dong smiled and folded his hands, "Let's get down to business, you can't go outside directly to dig the soil, I took samples when I was on the Kunlun station, most of the soil on Mars can't be used directly to grow crops, because the chloride salt, chlorate and perchlorate content in it is too high...... To put it bluntly, it is too dry and salty for this kind of soil-based tomato to survive, and you need to find a soil with slightly better basic conditions. ”

"Still looking for it?"

"Of course you have to find it." Mai Dong nodded, "Have you ever seen anyone who would grow tomatoes in saline soil?" ”

"So is there a way to reduce the salt content in the soil? For example, filtration and extraction or something......"

Mai Dong spread his hands, "Most of the extraction solvents are toxic, and I think it's too troublesome to do this, because the amount of soil you need to use is very large, and the biggest question is, do you have this condition?" ”

"Do we have what it takes?" Tang Yue turned his head to look at the old cat.

The old cat pinched a broken and charred beard in his paws, and looked sluggish.

Tang Yue twisted his head back.

"Okay, let's look for it."

·

·

·

"I suggest you use Martian stray dogs, with the Kunlun station as the center, and evenly sample in an area with a radius of one kilometer."

Tang Yue put on the Mingguang armor and opened the garage with the old cat.

They don't often use Martian stray dogs, and the rover is actually very cumbersome to use, and it consumes too much energy, and it is the most power-hungry thing in the entire Kunlun station. The Martian Stray Dog is essentially a tractor - it is called a geological research vehicle because it is dragging a geological experiment module behind it, and if you replace the experimental module with a garbage bin, then the stray dog is a Martian garbage truck.

The Martian Stray Dog looks tall and mighty, but in fact it is a battery car, powered by a battery, driven by an electric motor, without suspension, slow as a turtle crawling, and at full speed it can surpass a bicycle, with basically zero off-road ability.

In the past, when the scientific expedition team was still there, it often happened that the stray dog was stuck in the sand pit and could not move, and the crew had to get out of the car and push the cart collectively, which was actually a short-legged dog.

When this car was designed, it was not designed to run long-distance transportation, its only function was to move the experimental cabin, to facilitate the field investigation of the geological experiment cabin, so far, the farthest distance that the Martian stray dog has run is not more than 20 kilometers. Theoretically, a stray dog can travel 30 kilometers on a single charge – and then have to stop and recharge.

But in fact, it has never reached this theoretical value, and Lao Wang once commented that the Martian stray dog "charges for five hours and works for half a minute".

More OPPO than OPPO.

"How many samples are we going to take?"

"Tang Yue, you can draw a quadrat." Mai Dong replied, "But I think a sample of about twenty is enough." ”

"And then find the most suitable soil among these twenty samples?"

"Yes."

The old cat opened the car door and sat in the driver's seat, Tang Yue also climbed up, the cab of the Martian stray dog is not airtight, so the crew must wear an extravehicular spacesuit.

The driving style of the Martian stray dog is very simple, a steering wheel plus brakes and accelerator, step on the accelerator to accelerate and press the brake to slow down, a start button, a press to start, a shutdown button, press to turn off - I don't know which neuropathy also marked a "happy journey starts here!" on the console! Then point the arrow to the start button, pure retarded style.

Anyway, no one on Mars came to steal the battery car, and if the stray dog really let someone steal it, then this is not a simple theft incident, but an interstellar diplomacy incident.

There are also a few meters that show electricity, location, and temperature, comparable to bumper cars in an amusement park, or the kind that happily "Daddy's daddy calls grandpa" at the push of a button.

The old cat fastened his seat belt and glanced at the power balance, the battery was fully charged, and the Martian stray dog was always on standby and would be fully charged every day.

This amount of electricity should be enough for them to run twenty or thirty kilometers.

"Martian Stray Dogs, Activate." The old cat pressed the start button, and the body of the rover trembled slightly.

A few seconds later, the car stalled again.

The old cat was stunned for a moment.

"I think it's probably because you didn't call it by its name, and it's not happy anymore." Tang Yue said, "You can start it again and try it." ”

"Martian Rover, Activate."

The old cat pressed the start button again, stepped on the accelerator, and this time the car moved, slowly driving away from the garage.