Bufan stared at the green lines on the monitor - the results of the GPI were all displayed on it, flocculent and trivial only a thin layer, which was already a somewhat crisp layer of ground cement, and the same fine granular layers were layers of soil of different compositions, and then the thin green lines outlined a block of rocks of different sizes, which were pieced together into a soothing arc, and then ...... down There are no large blank spaces in the lines...... Cavity!

Leaving the screen of the monitor, Bufan looked at the somewhat wet ground under his feet, and compared it with the fairly straight lines on the side of the wall, he noticed that the ground was very obviously showing a sinking arc - a symptom of a funnel collapsing!

If you hadn't tested it with a ground penetrating imager, who would have thought that less than a meter below it would be empty?

But anyone who knows a little about geology knows that the surface of the earth is not uniform, mountains, hills, plateaus, plains, basins, rifts, ...... Under these appearances, there are different uneven crusts composed of magmatic rocks, metamorphic rocks, conglomerates, sandstones and mud, and the forces between these uneven materials are different, coupled with the high-temperature extrusion of the hot magmatic base liquid under the earth's crust and the erosion of liquid water fluids, it constitutes a large amount of underground space, some of which are very large, large enough to accommodate a giant aircraft carrier, and some are very small, small enough to accommodate small reptiles such as four-legged snakes.

To the east of the city is the Daqing Mountains, which belong to the folded mountain system formed by plate extrusion from a geological point of view, and the strata are mostly layers of metamorphic rocks...... According to the knowledge in his memory, Bufan only hoped that the cavity in the ground would not be too huge, and the rocks under the crispy cement should not be sandstone conglomerates like tofu slag......

Emerging from the ground, Bufan went straight to the material warehouse.

Pushing the hydraulic liftable hydraulic car, the solid rubber wheels rub the "buzzing" sound on the hardened cement floor, twelve six-meter-long I-beams, loaded, seamless pipes with a horizontal bearing capacity of 3,000 kilograms, loaded, six mm steel bars to build a 60-meter-long conveyor chain, loaded, and a chain tamper with a bearing capacity of eight tons......

Ding Ling's voice resounded in the quiet warehouse.

After transporting the things underground, when he returned again, Bufan, who was pulling a hydraulic car, found a person standing at the door, "Bagan, why are you here?"

"Brother Fan, boss, it's twelve o'clock in the middle of the night, why are you still busy? I thought there was a thief!" Bagen, who was wrapped in a fur jacket and carried a rubber stick in his hand, muttered complainingly.

"Ha! What's the boss? Brother Fan!" Bu Fan replied with a haha, "I'm used to being busy, I can't be idle! Don't you also sleep? Four meters high exterior wall, which one doesn't open his eyes to steal things?"

"Don't underestimate those three hands!" Bagan pinned the rubber stick to the back of his belt, and pulled the hydraulic car from Bufan's hand, "What else do you need?" Brother Fan, I'll help you load!"

Bufan pulled out a list from his pocket and casually read: "I want a wind drill and a bundle of 380V cables...... Well, 12 wire ropes for two coils, but also a reel......"

"Brother Fan, what are you going to do here...... These neighbors do not rely on it...... Wind drills, wind drills, which shelf......" Bargen flipped through the list of items on the side of the shelves, muttering incessantly as he looked around to find what he needed.

"Bagan, you have a muscular head, you don't understand it!" Bufan coped with it very casually, and was very familiar with Bagan's seemingly casual inquiry—for survival maniacs, it is instinct to keep one's own secrets as much as possible.

"Brother Fan, don't underestimate people, when I was a soldier in the automobile regiment, the veteran who repaired cars used scrap parts to build a transformer, and I even reached out to help!" Bagan pouted and continued to mumble, "Aha, I found it, who put the wind drill in this unlucky place......"

Bufan tore off a coil of wire rope from the shelf, and while rolling on the ground, he dealt with Bagen, "The thing you veteran made is probably just an ornament, wait for two years, brother will get you a moving Transformer!"

"Really?" Bagen was stunned for a moment, and then said: "Brother Fan, don't fool me, if you can make a transformer, our institute will not be world-famous?"

The two of them talked casually, and they all came to the side of the hydraulic car.

Bu Fan used his hands hard to directly put the nearly 200-pound wire rope roller on the hydraulic car, and then explained calmly: "I said you don't understand...... You've been a car soldier, but do you know? America is working on an exoskeleton for soldiers, have you heard of that?"

"Well, I've seen it on TV,......" Bargan put the drill on the wire rope roller and stopped.

Handing Bargan a cigarette and lighting one himself, Bufan continued: "The ones you see on TV are well-known things, just fooling the layman, those Yankees in America are studying mobile suits equipped with armor, and the power source is a high-energy battery, which can last up to four hours, and before I returned home, I heard that it was already being tested in actual combat!"

"Huh, so powerful?" There have been too many hearsay messages these days, and as a veteran of the army, Bagan is not so easy to fool.

"Don't believe me, this is what I heard from a friend from Oxford, England!" Bufan said nonchalantly, "It's nothing, whether it's John Bull or Gallic chickens, many universities wear the same pants as the military, and step-by-step robots are the latest topic! ”

"Hmm......" Bagan replied in a dull voice, then his eyes lit up again, and he asked, "Brother Fan, can you really make a Transformer?"

"it!" Bufan slapped the curious veteran on the shoulder, "Go help me with that thing, I'm still busy! I really want to make a Transformer, I can't afford to buy raw materials even if I'm bankrupt!"

"Hey!" Bagen was not annoyed, walked a few steps, and turned back and said: "Brother Fan, I can remember your words, I must come up with something new......"

"Nonsense! "Go on!" Bufan didn't bother to say more.

Bagan was busy in high spirits.

......

All the tools he had planned to need were transported underground, and Bouvan began to get busy again.

The straight I-beam is staggered and fixed on the ground, and the depression on the ground becomes more and more obvious, and Bufan tied a safety rope to his body, and then stepped on the I-beam, and began to drill at the lowest point with the air drill.

Wind drills, also known as wind picks, are used in most road construction and mine excavations, and are the best tools for one-man operation to break rock formations.

The high-horsepower wind drill purchased by Bufan is even more easy to use, under the vibration of the wind drill, the cement layer that has been crisped is really cracked layer by layer like a shortbread, and the sand and gravel that is simply paved below is completely crushed, stop, shovel these debris aside, and the hard limestone layer with gaps is exposed.

Bouvan breathed a sigh of relief, not the conglomerate and sandstone layers he feared.

Using the ground penetrating imager again, Bufan outlined the direction of the limestone cracks on the ground according to the texture presented on the monitor, figured out the direction of the rock fault, and then used the wind drill to excavate, as long as the operation is fine, there is no need to worry about the problem of large-scale landslides.

Fiddling with these tools is really not difficult for Boufan, after all, he is not the kind of nerd who wants to get into the pile of old papers. The rock layer at this settlement point is really not thick, plus water seepage erosion, but the limestone layer of more than half a meter can't resist the rapid vibration of the wind drill, after the continuous "buzzing click" sound, Bufan only changed hands four or five times, and then drilled through the sinking rock formation, and a fist-thick pitch-black hole appeared in his field of vision.

Stopped, listened to the movement below, threw down a few cold light light sticks, and a few seconds later, a crisp snapping sound came from the bottom, and Bufan was much more relaxed - it wasn't very deep below.

Don't think about it, just keep digging.

The wind drill continued to click and vibrate, and soon the fist-sized hole expanded, half a meter, one meter, two meters...... Bufan stopped again, he was not worried about the rock formation suddenly breaking and falling, and the I-beam frame laid on the ground was not an ornament.

took out a diesel torch that had been tied up earlier, lit it and threw it down, but the torch was not extinguished - there was no shortage of oxygen underneath, and then with a strong emergency light to assist the lighting, Bufan easily found that the space below was not very deep, and the emergency light could even illuminate the rocky ground at the bottom, that is to say, the height of the large cavity below did not exceed thirty meters.

However, for the time being, there is no need to measure accurate depth data, and a rough sketch of the bottom cavity is what Bufan wants to do.

Use the wire rope to bundle the wind drill and cable, emergency lamp, and iron drill one by one, and then move the chain guide over, connect the iron ring chain in series, and borrow the I-beam as a fixed guide rail...... The rest of the preparations are almost ready.

Bufan checked the protective equipment on his body again...... Towing lanyards, helmets, non-slip gloves, elbow pads, knee pads, waterproof boots, T-picks, planing roots...... A lot of bits and pieces, in short, everything needs to be carried, the following situation is unknown, and it is impossible to be careful - the word "prepared" is the best backup force for survival maniacs.

Because he didn't want to delay it for too long and didn't have time to make special lifting equipment, Bu Fan chose a chain guide that could withstand eight tons of traction with dozens of meters of chain as a temporary lifter, well, this is really a bit overkill, Bu Fan never had any phobia of confinement, so he ...... Everything went smoothly, and in a very short time, he went down to the bottom of the underground cavity.