Along the way, they also encountered many other unknown entrances, but Bai Yujing and Zhou Jun always followed the traces and waterways of this artificial excavation, this road was not straight, and when it was excavated, Liu Quanyi did not have the ability to dig down a straight road.

So Liu Quanyi chose to find a place that is easier to get through and dig down, Bai Yujing in many places, you can also see the traces of using gunpowder to blow up the boulder, indicating that Liu Quanyi also used gunpowder at that time, but this is also normal, in the Ming Dynasty, gunpowder was used to mine iron ore, which has also been recorded in the history books, and Bai Yujing is not too surprised.

Starting from the morning, looking at the time at this moment, Bai Yujing found that it was already the early morning of the next day, and the two of them had good physical fitness and will, but they couldn't help but rest, and walked a little further, Bai Yujing and Zhou Jun put down their backpacks, took their things to make a fire, warmed their bodies on one side, and made something hot to eat on the other side.

In the depths of the earth, the further down you go, the darker and colder it becomes, although there is no wind, but the cold smell can't even cover the clothes, not to mention the dampness and humidity in this environment, the clothes on the two people are a little stone, and at this time the roasting fire is just drying.

"Okay, I'll be busy, you have something to do!" Zhou Jun took over the cooking fire, which is actually to cook some dehydrated food, and the two often run around outside all year round, and they are very familiar with these fast foods and compressed dehydrated foods.

With the light of the bonfire, Bai Yujing opened the silver box and released the terrain detection drone, just to explore the surrounding environment, by the way, to see if it is safe and dangerous in this vicinity, the infrared of the exploration drone can not only detect the terrain, but also perceive whether there is other life around.

After releasing the drone, Bai Yujing took the geological water vein map and looked at it, calculated the location of himself and others, and detected the surrounding rock formations, and after making many determinations, Bai Yujing stopped: "We have walked most of the way, let's take a break and set off, we should be able to get to the dark river in one go." ”

Zhou Jun nodded: "That's good, let's take turns to rest at night, and we'll go as soon as we wake up!"

Ordinary people will feel fear, helplessness and panic in such a dark and silent place, and staying in this kind of place for a day in an unknown depth is enough to drive people crazy.

However, Bai Yujing and Zhou Jun did not feel this way at all, the situation of the Antarctic polar night was a hundred times worse than here, counting the cold of minus fifty or sixty degrees Celsius due to the wind chill effect, all kinds of dangers and difficulties did not stump them, here, for the two of them, it was like a child playing at home.

"The rice is cooked, let's eat!"

The two of them were eating and talking, and it didn't take long for Bai Yujing to see the drone flying back, Bai Yujing looked at the computer, put away the drones one by one, and the small round drones were put together and inserted into the round pit of the silver-white box.

"One, two, three, four, five, how can there be one less?"

Bai Yujing felt that something was wrong, and sure enough, the computer also prompted that one of the terrain exploration drones had not been recovered, and Zhou Jun immediately said: "Could it be that you are lost or out of power?"

Bai Yujing shook his head: "This box is actually a power supply, it comes with a computer and charging function, every time the drone is recycled, it will be charged in this pit, the power supply should be full, it must be enough, this kind of drone exploration will return the same way if it encounters a dead end, it is impossible to get lost, it may be that it is slow down in the middle, and it has not been rushed back yet!"

Bai Yujing then waited a little longer, but still didn't wait, Zhou Jun immediately said, "Do you want to go over and have a look?"

Bai Yujing shook his head: "It's just a drone, how can it be so expensive, if you lose one, you can lose it, don't have an accident, it's just that this drone is weird, I'll see which route he went? ”

Zhou Jun immediately nodded, took out the sleeping bag from his backpack, sat next to the bonfire, and fell asleep with his eyes closed, while Bai Yujing looked at the route that the drone that had just disappeared was going on the computer.

The other drones were recovered, Bai Yujing took a look, and the computer immediately summarized the terrain and information they had adopted, calculated the terrain route they had just explored, and immediately an underground network deep below appeared on the computer.

Bai Yujing took a look, the drone just now explored the third entrance below, and there was another drone that went in at the same time, but at the same time there was a fork in the road below, Bai Yujing marked it, and found that this fork in the road was also where they would pass through tomorrow!

After resting and recuperating, the two set off again at seven o'clock in the morning, but the underground cave could not tell the time at all, and it was dark and dark everywhere, and it was difficult to discern the direction.

After Bai Yujing made a mark on the wall, the two of them put on their backpacks and walked down, the two walked very fast, and in the darkness, only the light of the two searchlights that they were looking for flashed by, and the two of them passed through a passage and turned the next corner.

Soon, Bai Yujing walked to the fork where the drone disappeared yesterday, Bai Yujing looked left and right, stunned, because the two roads separated by this fork have traces of artificial excavation, and it looks as if someone once deliberately dug two roads here, leaving a confusing fork.

Zhou Jun also checked it, but he didn't quite understand: "What's going on, is this Wang Quanyi sick? He's a tomb robber, who is left behind to confuse him?"

Bai Yujing took out the geological water vein map and looked at it carefully, then took out a compass to determine the current location of the two of them, pointed to the fork on the left and said: "According to the right direction, we should be heading towards this place, but yesterday our drone entered through this entrance, and then disappeared inside." ”

Zhou Jun seemed to sense that there was something in Bai Yujing's words: "What do you mean?"

Bai Yujing thought for a while and said: "Why does Wang Quanyi want to open two roads, the right direction, it should be to dig down here, we are already almost reaching the underground river, according to my calculations, from this direction, it should not take a few more hours to arrive, but Wang Quanyi has to open another road from here, which will increase the amount of work and trouble." ”

Bai Yujing looked at Zhou Jun and said, "So they should have encountered something on this road, which could not be passed here, or something was dug up, so they gave up going down from here." ”

Zhou Jun thought for a while: "If we come from here, we will spend an unknown amount of time, and who knows where this fork in the road leads, you said that this direction is right, or we can go down from here and take a look, and withdraw in any situation!"

Bai Yujing thought for a moment and agreed with Zhou Jun's statement: "Okay, then go down from here and take a look!"