In Whitehorse City, where there are nearly one million people, Bu Fan is just an ordinary returnee student, if it weren't for spending tens of millions of dollars to buy land, I'm afraid there would not even be a ripple.

Bu Fan deliberately kept a low profile, and Bu Dad's mother didn't bother to show off, everything just fluctuated slightly, and then he returned to calm.

Of course, traces are not without them, but they are limited to a limited number of neighbors and a few relatives and friends, as well as the relevant management of the city of Hakuba. Hakuba, a city close to the pastoral area, is still different after all, and most of its inhabitants have the broad-mindedness of the steppe people, rather than coveting the property of the neighbors.

In 2019, Bu Fan finally established his private research institute, his sister Bu Nan was admitted to the School of Economics and Management of a university in Beidu, and Bu Da Bu Ma was like a sea on the grassland, deep and calm and undisturbed.

After the gantry crane was in place, a large number of equipment ordered by Bufan began to arrive in the second-tier cities on the edge of the grassland, except for two five-axis precision machining centers, there was no too high-precision equipment, so it did not attract any media or attention.

This feeling of doing things in a muffled voice can be said to be very much in line with Bufan's appetite - he can use the reason for installing and debugging new equipment, and calmly fool Bu's mother's questioning eyes from time to time, and do something that he has planned for a long time.

For example, during the day, as the owner of the research institute, he debugs various equipment, and at night, he runs underground to open up his safe space. This state, how to put it, is like a glorious Dr. Turtle during the day, and a mole digger digging a hole in the earth at night, and even Bagan who helps him doesn't know it.

In Northeast Asia, the temperature often drops below zero degrees Celsius in mid-October every year, and the soil layer on the surface is called frozen soil.

And at a latitude like Hakuba, such a surface permafrost layer would reach at least half a meter deep!

However, this will not affect Bufan's civil work in the slightest, because the blocked civil air defense project is eight meters above the ground! At such a depth, as long as Bufan does not use any large instruments such as shield machines, there is no need to worry that outsiders will find out.

......

It is not an easy task to break through the concrete prefabricated parts of an engineering company, at least with a hammer and pestle, it will only do half the work, but for a doctor of engineering and mechanical engineering like Bufan, it is completely effortless.

It took him a few days to put together a water sand cutting gun from the parts he bought. It is said to be a gun, but in fact, this thing is a re-modified ultra-high pressure water gun, with a quartz sand injection equipment attached in the middle, and the water and sand mixture sprayed out by opening the valve is the best cutter. As for the effect, cutting twenty or thirty centimeters thick concrete floor slab is like a joke, the so-called concrete prefabricated parts are only slightly thicker in size, the water and sand flow a few more times, and the concrete prefabricated parts are neatly divided like a knife cutting tofu.

Cleaned up the cut concrete blocks and clogged bricks and rubble, once found in the excavation of the civil air defense project entrance exposed, Bufan is not in a hurry to go in to explore, the basement room where this gap is located has long been secretly set up, although there is no need to worry about someone breaking in, but for the sake of insurance, Bufan still installed a secret door in the newly opened opening, and then set up an exhaust channel, the exhaust fan turned on him overnight, and it is best to replace the turbid exhaust gas inside, in addition, the thoughtful Bufan also set up a monitor and sound collector at the entrance of the channel, and after everything is completed, which is the end of these initial laying things.

The monitor is very simple, it is to monitor the movement at the entrance, the sound collector is not an ordinary microphone and the like can be compared, Bufan set up to use this, its collection range can reach hundreds of meters, in this sealed and quiet underground environment, even the slightest movement within a kilometer will not be missed!

This kind of underground environment is not at all simpler than that on the ground, and it is possible that semi-hibernating snakes, wolverines on the steppe, weasels, and even black bears may use this underground shelter as a nest, and in addition, outlaws such as the so-called wanted criminals mentioned above may also use this kind of place as a hiding place.

Taking risks is not a child's hide-and-seek, and you can't be too careful. In general, the kind of people who dare to do anything recklessly in movies, television or novels, in the actual situation, most of them have already been a foot high in the grass.

The next day, Boufan brought two large chests back down to the underground chamber, which contained the same stuff he had used in Europa.

Detection equipment such as low-light night vision devices, infrared scanners, simple metal detectors, complex ground penetrating imagers, self-defense equipment such as anesthesia probes, high-voltage arc guns, stab-proof suits, crossbows, daggers, etc., are all available.

The entrance of this so-called civil air defense project is actually a half-cut passage of the passage, and it is not a problem for Bufan, who is 1.85 meters high, to walk in straight after his whole body is neatly draped!

After the kick-and-tap footsteps entered, the headlamps swept over the wall, and the dark red slogan on the blue-black wall told Bufan that this should be a product of the fifties and sixties of the last century, and the corners of the walls on the ground were full of dust and cobwebs and other debris, which could be seen that this kind of place had not been visited for at least decades, and the circuits that went around the walls of the passage had been rusted and aged, and the lights appeared at the corners or on the top from time to time with metal anti-collision nets, and if you looked closely, you could find that there were the engravings of the sickle and axe and the words CCCP on them— It turned out to be a product of the time of the Slavic Confederates in the last century......

Walking along the cracked and broken cables of the patent leather, zigzagging around at least a dozen heavy iron doors half a foot thick, Bufan easily spotted a power distribution room and dozens of warehouses of various types, the diesel generators in the distribution room had been badly corroded into a large iron lump, and the warehouses were mostly empty, but they were not for nothing—there were still some things in them.

What Bufan wanted was a confined space that could be borrowed to build a safe house, and he didn't expect to find anything useful, but the result was a bit unexpected, three warehouses were about to rot into mud like cotton clothes and the like, one of the warehouses was stacked with more than a dozen long wooden boxes and five square wooden boxes, when he pried open the long wooden box to check, he found that it was an old-fashioned 38 rifle wrapped in butter paper, counting ten per box, there were as many as 170 in total, and he hurriedly opened the square wooden box again, and it was a completely matching point 38 pointed bullet, each square wooden box had 2,000 bullets, and there were a full 10,000 bullets！

Bu Fan went to the last warehouse with a few boxes stacked, and when he opened the boxes again to hunt for treasures, he found that it was also a Japanese ordnance, and the style was very old! He couldn't figure out the specific model, but he knew that this thing was a hot potato that couldn't be seen!

It is not uncommon for there to be munitions left in underground civil air defense projects, and it is not surprising that there are even dead human bones, but how can there be old-fashioned ordnance from the Second World War era?

However, in this kind of underground ruins from decades ago, it is not surprising that there is anything strange, since Bufan dares to set foot here, he has this psychological preparation, a little bit of arms and weapons, it has been eliminated for many years, and it is not that he has not seen it, he did not put it in his heart like a treasure.

It took another three whole days, except for a few sections that were seriously collapsed and could not be passed, and Bufan probably figured out the remaining civil air defense projects underground. The roads in the underground works are tortuous, and the heavy protective iron doors can be seen everywhere, and it is impossible to accurately measure their size in a short time, but there are hundreds of rooms in total, and there are a lot of miscellaneous and tattered ones, but except for those munitions and two scrapped generators, they are basically disposed of as garbage.

A small problem arises, nearly half of the area of this underground project is not under the land purchased by Bufan, but under the station of the original 108 artillery regiment on the west side, but that section is very badly damaged, and the ground is also rubble, according to the plan of the city government, this area will be the shelter forest belt in the north of the city in the future, if there is no accident, it is not afraid that someone will dig a dilapidated project eight meters deep underground.

However, for Bufan, this place is enough as an underground safe house, and the eight-meter dense soil layer is difficult to break through even a delayed ground-penetrating missile.

The saying goes, what comes is safe, and this sentence may not be bad here. Since he chose to build a research institute to do a bright business, and found this okay underground project, Bufan is already very satisfied.

Satisfied, Bouvan began the next step, spending six hours a day doing some repairs underground—no small amount of work.

In order to prevent the area of the collapse from continuing to expand, and at the same time to prevent people from digging down the clues, Bufan used a large amount of garbage and rubble to completely seal the collapsed places, and then re-erected support columns and sealed them with layers of stones and concrete; more than a dozen holes dug by small animals such as rats were also completely filled with cement mortar; several of the old vents had been blocked and were not suitable for re-excavation, so Bufan had to choose to re-lay them.

This is even more difficult, it is necessary to dig up the skylight and other structures, if the top structure is not supported, it is very easy to collapse, and then Bufan will inevitably be buried silently in the ground......

Fortunately, when Bufan returned from abroad, he brought back a ground penetrating imager, which is a good thing, which can generate three-dimensional images through the magnetic field induction of different media in the ground, and there are cavities, huge rocks, metal objects and so on in the stratum, all of which cannot escape its induction.

Use this thing to probe and then choose the direction of the vent, and even make a directional reference for re-opening the escape route......

Repairs and reconstructions are going on day by day, and seeing the underground safe house getting better and better, Bufan can be said to be busy and excited.

In mid-December, Christmas and New Year's Day are approaching.

As he leveled a somewhat damp and seeping ground, Bouvan scanned it with a ground penetrating imager, and was shocked by the image presented on the monitor - a very large cavity beneath the tattered cement and the not-so-heavy rock!