When they returned to camp, it started to rain, and the soldiers were digging drainage ditches next to their tents.

Some people have done some calculations and believe that this rain will be heavy and may last for several days.

Well, being able to predict the future is feudal superstition; they did check the weather here before they came.

Although it's not the time of year with the most rainfall, each rain shower lasts for several days.

The rain didn't have much of an impact, as everyone had tents and warm clothing. It was just that completing the task quickly was impossible.

The traces of the secret base were already few, and after it rained, the traces became almost invisible.

The leaders and their comrades returned in the rain. The cooks made ginger soup and gave it to everyone, which made them feel much warmer.

The commander and Captain Qin discussed it for a long time, but they couldn't come up with a solution. They could only wait and see how heavy the rain would be tomorrow.

"After this rain, someone has to leave. After all, the manpower and resources spent here are not a small amount."

The leader sighed.

Team Leader Qin nodded. "We need to hurry. The longer we wait, the more people will leave, and the more exposed we'll be, which will be even more dangerous."

When there are many people, they can take advantage of the chaos; when there are few people, it's not a big deal if they expose themselves, but it will expose Lin Chuchu's special qualities.

"I'll lead my men on another trip tomorrow. I refuse to believe that such a large secret base would be completely uninhabited."

The leader made a firm decision.

"good."

The next day, the light rain turned into a downpour. Apart from the commander leading several teams to search, the rest of the people could only stay in their tents.

The food was prepared and the people in the tents were asked to fetch it.

The rain outside was very loud, and there was even thunder, the rumbling sound seemed to explode right next to my ears.

Lin Chuchu was a little worried. After finishing her meal, she took out some medicine to dispel the cold, medicine for colds and fevers, and some hot water bottles.

"Captain Qin, please help deliver these things to the tents. If you catch a cold, take some medicine quickly."

Each tent has a small stove where you can boil ginger soup and hot water.

The tent was a bit damp, but it was designed to prevent rain from leaking in. The ground was dry, but Lin Chuchu still felt a bit cold, so she wore a thick coat and had a water bottle on her person.

"The air in the mountains changes so much. When it's not raining, it feels like summer, but when it rains, it feels like autumn. Why does it feel so cold?"

Xiao Lu complained, making the same gesture as Lin Chuchu.

The others were better off, being more resistant to the cold, but Lin Chuchu and Xiao Lu were not.

The two huddled together, warming themselves by the fire.

To prevent poisoning, holes were specially made in the tents for ventilation.

The soldiers returned quickly, wearing raincoats and their clothes were soaked.

I thought it would be cold back in the tent, but to my surprise, there was a stove burning in each tent, with hot ginger soup on it.

They also had a change of clothes. They didn't know where these came from, but they wouldn't ask, since it was for their own good.

The leader and Captain Qin discussed for a long time and, following Chinese customs, found two suspected locations. They were somewhat remote and places that no one else had set foot in.

When Captain Qin returned from outside, he voiced his questions.

"Where do you think the base was relocated after it collapsed? There must have been a lot of people in the base. If they were digging underground, large machinery couldn't get in. How did they dig out the base?"

Lin Chuchu also had this question: "Could there have been caves underground originally?"

Xiao Lu nodded. "Possibly, but where is the cave entrance? What do they eat and use? And where do they get their salt?"

Humans cannot live without salt, and with impassable roads, it is not easy to carry grain into the mountains. If plants are to be grown, suitable land is definitely required.

It needs to provide a long-term food supply, be underground, and have an essential water source.

Lin Chuchu felt as if she had missed something.

brine……

Oh, and the underground river...

"An underground river, perhaps there is an underground river."

“The terrain in the mountains is high, so lakes cannot form on the surface. Therefore, there is a high possibility that there are underground rivers.”

"Try to see if there are any naturally formed caves with relatively hidden entrances."

Team Leader Qin frowned. "But the entrance is hidden, and if the entrance is small, the cave must not be big either."

Lin Chuchu shook her head. "Just because the cave is small at the beginning doesn't mean there aren't other caves inside. There might be other entrances inside."

Another theory is that everyone in the secret base has probably been evacuated, but there might be some people left behind. This would mean they are very confident that the base will not be found, or that it is either well-hidden or unexpected enough.

Team Leader Qin's eyes lit up. "That's really possible. I'll go tell the commander tomorrow morning."

They didn't have a geologist, otherwise there was another possibility: there might be a salt mine nearby, and if the salt mine was confirmed, the cave must be nearby.

Although Lin Chuchu was unsure about this idea, it was still better than searching for a hidden base entrance all over the mountains and fields; at least she had a general target.

The next morning, fearing he would waste time, Captain Qin went to the commander's tent before dawn and shared the speculations of the group.

"Yes, your idea is correct. There is another possibility: when it rains, there must be a drainage ditch outside the entrance to prevent rainwater from flowing back into it. The heavier the rain, the more obvious the drainage ditch becomes."

"I will send people out now to start searching in the nearby mountains."

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