Bi Fang's mobility was very high, and after a short period of repairs, he began the "wall" project.

It's as simple as digging a trench around the hut and sprinkling it with a mixture of ice water mixed with wood chips.

In extreme temperatures, these mixtures freeze into ice almost instantaneously, quickly forming a wall that is impregnable.

"Ice is a solid substance formed by water, and it is well known that thin ice shatters when touched like glass. However, ice is as hard as steel, as strong as concrete, which is something that many people don't know. ”

"It's actually very simple to add a little bit of wood chips to it."

"Ice cubes and sawdust may sound a bit nonsensical at first glance, but in fact it has a professional name, called Parkray, which is a kind of composite material, just like reinforced concrete, which is a composite of cement and steel bar."

The audience didn't know what Parkret was, but as soon as Bi Fang said reinforced concrete, everyone had a clear idea.

[What kind of pie can this compare with cement? 】

The audience is a little unconvinced, ice and wood can be as hard as cement?

"If the conditions are right, it can." Bi Fang once again uttered a startling remark.

"Parkrete is a composite made from sawdust or other pulp at approximately 14 percent by mass and 86 percent by mass ice."

"During World War II, the Allies mixed wood fibers with water and froze them. Wood fibers form a woody layer that makes the ice less likely to melt. This added ice is as hard as steel. ”

"An inch, or 2.5 centimeter thick ice board, can support the weight of six people, and a 10-centimeter thick ice plate can hold off bullets."

"This ice plate was invented by Jefferson Pike, so the Allies named this ice compound 'Parkreit'."

Under Bi Fang's explanation, the sailors also understood how awesome this strangely named composite material is, and also knew its glorious history.

During the two wars, when the Germans continued to sink transport ships, the Allies always wanted to build a ship that could not be blown up by shells, bombs and mines, and the "Parkreiter" became the ideal material for shipbuilding.

Later, the Allies used Parkray as a material, and Makoi built a small transport ship 60 feet long and 30 feet wide, which sailed on water at 60 degrees Fahrenheit for days without melting.

That's 60 degrees Fahrenheit, which is equivalent to 15 degrees Celsius, which is basically the water temperature during spring and summer communication, and it can last for several days in this case, which is outrageous.

Later, due to the end of the "two wars", the "Parkreit" ship was not continued to be built, but it was also used as an anti-tank obstacle, which was not uncommon in Soviet military textbooks published in the 40s of the last century.

During the two wars, the central state also carried out a Habakkuk project, which was planned to build an aircraft carrier plan to deal with German submarines in the Atlantic.

However, during the construction of the test ship in Canada, it was found that the composite ice material could not support its own weight on the large hull, and the construction plan was discontinued in 1943 due to the disagreement in the design of the power part, but even so, the abandoned hull was not completely melted down until three years later.

Of course, such behavior still seems absurd today, but a hundred years ago, someone did try it.

Hearing is false, seeing is believing, Bi Fang raised the stone hammer in his hand and smashed it directly against the solidified wall, accompanied by a muffled sound, some surface ice fell, and the wall was intact.

[I rub, bullfrog]

[It's hard to look at]

The wall was made very quickly, and it only took two days for Bi Fang to encircle the entire wooden house, reaching a height of 1.6 meters.

At such a height, polar bears can only climb if they want to come over, and wolves can jump, but it is enough to stop their charge and counterattack to a certain extent.

In short, it is full of security.

After another week, the wolves did not return, and Bi Fang completely gave up his line and continued to ride a dog sled, running all over Greenland to see if there was any prey, or to enjoy the Arctic scenery.

Feeling the vigorous beating of salmon, tracking the magnificent migration of reindeer, and encountering various animals and environments that you would not know in the city, all the audience's yearning for Greenland was satisfied.

Such days lasted until late December.

At this time, even Bi Fang himself couldn't quite remember how many days he had survived, maybe more than sixty days, or maybe more than seventy days, in short, there was probably one month left before the end of survival, maybe before the end of survival, he could meet the scene of the sun rising again.

In this situation, Bi Fang finally encountered another heavyweight predator on Greenland - polar bears.

Maybe it can't be said that I finally met, Bi Fang has met a few times before, but they all looked at each other from a distance, and they didn't meet so closely as today.

"It's not a coincidence."

Bi Fang was stiff, and he didn't dare to move at all at this moment, because there was a behemoth lying on his stomach more than twenty meters in front of him.

At first glance, you may think that it is a small hill made of dry snow, but you can see the big head under the hill.

It was a chance encounter.

Bi Fang's initial target was an arctic rabbit, but unexpectedly, an accident occurred later, and an arctic fox suddenly jumped out, directly scaring the rabbit away.

The arctic fox is the arctic fox, Bi Fang didn't mind, but he followed, and followed behind the polar bear's ass, and when he found it, the distance between was only more than 20 meters.

One man and one bear are almost wide-eyed.

This bear is not the scrawny kind of animal protection organization photo, on the contrary, it is an out-and-out strong man.

Because he was lying on the ground, Bi Fang couldn't tell how long this guy was, but judging from the height, the weight was at least five hundred kilograms or more!

The only good news is probably that the six fools didn't follow long, their hunting ability is limited, and taking them with them will only scare away the prey, Bi Fang tied them to the back of an ice mound not far away, so he didn't have to worry about being eaten by the bear.

In summer, when food is abundant, the arctic fox stores part of its food in its nest.

In winter, when the food stored in the den is depleted, the white fox stalks the polar bear, picking up the leftovers that the bear has eaten.

So in the winter, there are always 2 or 3 white foxes quietly following the polar bear, and of course, if the polar bear is very hungry, it will also attack the polar fox.

Bi Fang suspected that this was the case for him.

The color of the polar bear is almost the same as the snow, and it is easy to ignore it if you don't pay attention to it at night, and Bi Fang himself is also unconsciously on the road, if he doesn't wake up suddenly, he may be closer.

Thoughts are like electricity, and the polar bear moves!