After putting on a windproof down jacket, Zhang Nan went out of the hotel with Lin Ming, Paul and Brother Mark, who had been waiting for him.

Ma Wei, Jiang Wangfeng, and Wangqiu brothers, who were sitting in the hall, immediately went out of the door first when they saw the boss coming.

The group still walked to the lodge, where the road was still covered with snow and the compacted places were already icy.

didn't let people clean up, as a southerner, Zhang Nan likes this feeling of walking in the snow, anyway, he doesn't drive.

When I arrived at the place, I didn't enter the main building, but went directly to the back, Xiang Weirong and others were waiting for Zhang Nan to come.

Without further ado, I went straight to the garage: good fellows, smoke was rising from the raised roller shutter!

It's not a fire, it's not a bunch of people smoking in there...

Even Xiang Weirong has quit smoking, and the bodyguards have already said goodbye to tobacco!

It was the chiseled hole that was emitting white smoke, and Zhang Nan immediately understood the reason: this was the phenomenon of the warm and humid air coming out of the underground space below being affected by low temperatures, just like the smoke from the sewer manhole cover in winter.

The white smoke was still rising, and there was a faint eerie smell in the air: the space under the ventilation duct at the entrance of the cave was definitely not small!

When I walked to the broken opening, I saw that the ventilation pipe was not small, with a diameter of more than one meter, and the cement knocked off by the air pickaxe was still two layers in different periods: the lower layer was of poor quality, and it was directly poured on a large lid of pig iron.

The upper layer is the floor of the garage, and the pouring time is probably the last twenty or thirty years: if the people who did this work had removed the original cement layer and poured it, the secret below might have been discovered long ago.

Zhang Nan looked up at the roof of the garage, "It seems that this row of auxiliary rooms was only repaired after the war." ”

The cement floor is layered on top of each other, and it is noticeable.

The opening has been found, and there is no danger in detecting the air, but the space below is most likely closed, so it is better to wait and send someone down.

It's been closed for decades, and the air is not good.

The flashlight shone on: like all large-sized ventilation pipes, the lower pipe wall was inlaid with inverted U-shaped steel steps for people to enter and exit.

At least 45 years ago, the steel bars have been in the enclosed space for so long, and the verbal ones seem to be fine, but some of the lower ones are very likely to have been corroded by the water leaking from the mountain, and people have to add safety ropes if they want to go down.

After seeing enough of the vents, Zhang Nan walked out of the garage, walked to the top of the west slope by himself, and looked at the valley below and was stunned.

Knowing that Paul was on the side, he pointed his hand at random and asked, "How much is the difference between this and the bottom?"

"It's about 200 metres from the centre of Klingenthal, and it's less than 100 metres vertical. ”

Klingenthal is a small mountain town built along a valley with a long strip of elevation of almost 100 meters.

In fact, this side has left the city, the altitude is higher, and you can have a comfortable bird's-eye view of the small town that is more than two kilometers and nearly three kilometers away in a straight line.

Hearing Paul's answer, Zhang Nan said again: "With the slope, the safety rope must be longer than the length to the vertical valley floor."

I have a feeling that the space down there should have something to do with the valley bottom. ”

How long?

Zhang Nan is not good at math and can't figure it out, but he doesn't have to worry about it.

This will open a ventilation shaft, and the space connected to it should be near the bottom of the valley below: no one will be idle and have nothing to do in the middle of the mountain, just have nothing to do.

With a ventilation shaft with a length of more than 100 meters, the engineering requirements of the lower space are very high, and the space is bound to be small.

As for now...

Wait, ventilation takes time.

Back in the garage, Boss Guan was arranging for the personnel to enter the vent to investigate.

"Wen Dong, Paul, Lin Man and I will go down together, squad leader, I will trouble you from above. ”

Kwan decided to go down in person, while the other three all had strong climbing abilities.

As for Zhang Nan, wait on top first, there is no need for him to go down and take risks.

You need a professional climbing rope to enter the vent, and I didn't bring it with you, but that's not a problem: there are professional hiking equipment stores in Klingenthal, so it's a small idea to buy a few hundred meters of climbing rope and supporting equipment.

When the vent was discovered, Guan Xingquan had already asked people to go to the city to buy the equipment they needed, and this time he came back after an hour of hard work, because he needed to wait for the store to open at ten o'clock.

The ventilation shaft has a slope, but when it shines down with a strong flashlight, it feels straight. Simply twist a cold light light rod and throw it down, pinch the time to count the seconds, and then calculate the length of the safety rope you need.

The four who were going to go down debugged the communication equipment again, and although this thing could not penetrate the ground, it was still no problem to communicate with the ground near the opening below through a straight ventilation pipe.

At eleven o'clock in the afternoon, the four of them went down the well.

Lin Man, who weighed the heaviest, took the lead, and when he tested the quality of those steel steps, the three people behind him pulled away and went down one by one.

There were four guys up there, using two nearby telephone poles, one of whom was responsible for a safety rope, listening to the sound in the headphones and slowly lowering it.

Lin Man's voice kept coming from the headphones: "... Fifty meters, the structure, step handrails are normal, no water seepage... 70 meters, a water seepage point was found, but it was dry, and there was no abnormality in the lower steel steps......

At the bottom, there is a small room with four concrete walls and a single-opening iron door, which is not sealed.

Captain, I'm on call for the time being, everything is normal. ”

Nice, everything works fine.

After a while, Zhang Nan heard Guan Xingquan's voice in his earphones: "Squad leader, there is an abandoned railway tunnel outside, which is very long and has no danger of collapsing."

I haven't found it for the time being, Paul and I will go to the north side to investigate, you can come down, Wen Dong and Lin Man will meet at the exit, the air quality is fine, the oxygen content is normal. ”

The call signal is secret, and there is no need to use code words, but the sound is a little hard.

Xiang Weirong, who was above, listened to the report and said, "Understood, we have collected the safety rope." ”

A few guys went up to collect the rope, and Xiang Weirong looked at the people outside, "Randy, Tu Haibo and Ma Wei will accompany Anan on a trip." ”

The brothers Mark and Jacob were eager to try it before, but they were a little helpless after listening to Xiang Weirong's words: no, their own brother is too heavy, and he still has to stay on top.

climbed the ventilation shaft, no matter what, it was not their brother's turn, and honestly pulled the safety rope to the boss.

Wearing a miner's lamp hat on his head, a rope sleeve between his legs, and from his chest up, Zhang Nan followed Randy down the vent.

Honestly step by step, the quality of the work of the Germans is not to be said, decades have passed, and the steps of the rebar have not loosened in the slightest.

After climbing diagonally for hundreds of meters, I finally reached the ventilation room.

Lin Man below helped the boss take off the safety rope, and at this time, from the iron door that was opened, he heard that Guan Xingquan and the two who had gone to the west side of the tunnel to investigate had returned.

As soon as he saw Zhang Nan, Guan Xingquan said: "There is nothing in the west, and it is completely collapsed from 500 meters away, and it is a large-scale blasting of explosives, and it is estimated that the scale is very large." ”

As soon as he heard this, Zhang Nan's eyes looked at the east side of the tunnel: there is a black hole!

"If there is, to the east!

The blasting was supposed to be aimed at completely sealing off and scrapping the tunnel. ”