Here I re-marked it, and it was still the more complex and clear kind that I had drawn. Then we set off to the second level as planned.

The flame of the torch jumped a little and then went out. I walked to the left side of the passage in the dark and heard Platoon Commander Zhao shouting, "We're all right." ”

The sound comes from the right side of the channel. I said, "Then let's go." Echo every ten steps. ”

All of this was agreed upon on the road, including me walking alone on the left side of the passage and the two of them on the right side of the passage. Based on our previous explorations, we can be sure that as long as we do not reach the fork in the road, there is a straight road in the passage, and there is no such thing as getting lost on this road. As long as you control the forward speed on both sides, it should be safe. It's just going to be slow.

At this point I looked at my watch, and we had been here for six hours from the time we entered the passage. The wound in my chest should be a fractured sternum, it doesn't hurt too much, it seems that the injury is not as serious as I thought, of course, this is also thanks to my physique, I can recover as soon as possible. I suddenly remembered the itching on my back when I was fighting with the brachiopod monster in the hole, and now I don't feel it anymore.

This road is either this or that, and it never stops, and as long as it is not a fatal injury, almost no one cares. Now it's even darker, and I can't check it at all, so I'm just worried about it for a while, so I put it in the back of my mind.

No matter how slow the speed is, as long as there is an end or fork in the passage, it will always come to it. Platoon Commander Zhao and I shouted almost at the same time: "It's here." ”

I lit the torch and immediately drew two warriors who had been in the dark for nearly an hour. I marked the exit and then searched around the three passages, but there were still no clues. I ended up at the right fork and drew that topographical sketch there.

This map should be left at every exit, so that Xiao Guolin and they can clearly know our current location and our purpose at every intersection. Another point is that in the second layer of searching, we have to go in a predetermined clockwise direction, but we don't have to turn right every time. We draw a diagram at each fork in the road, which also prevents us from making mistakes ourselves.

After marking the mark, I stepped on the torch and set off on the next fork in the road. Based on the fact that the speed was too slow last time, in order to speed up the pace, I put forward a suggestion to speed up the pace of the pace, sing a fast-paced military song to return from the target, and walk to the beat of the drum. Of course, it's not really singing, such a long way, and the voice can't stand it if you sing all the way, but every few bars, people on both sides of the passage take turns to sing a sentence, and replace the echo with singing.

It worked, and in less than half an hour we were on to the next intersection. Light torches, make markers, and after making sure that there is no trace of Xiao Guolin, continue to move forward.

Walking in the dark has an adaptation process, and when we get used to the environment, the fear will weaken or become numb to the fear, and the speed will gradually increase. This time we reached the next fork in the road at a faster pace. Similarly, the rapid march consumes a lot of physical strength, although we quickly marked it and quickly determined that there was no trace of Xiao Guolin and others, we still decided to take a little rest.

The three of us sat back to back in the dark at the intersection in the next direction of travel, panting loudly. This intersection is on the left hand side of the intersection where we came out, and it was then clear that my initial decision, that is, to draw a clear topographic map at each intersection, was the right one. Honeycomb passages, every two or three forks you have to walk to the left to make sure you search clockwise on the second floor, otherwise you may go to the first or third floor. This can also lead to confusion, and although you can follow the signs to find the starting point, it will not help you find a way out, and will only waste valuable time.

This requires an accurate reference, and we don't have a pen or paper to record every intersection we pass through. I also don't dare to expect my nervous brain to collapse and remember the direction we walked in every step. However, marking each intersection will definitely deepen my impression of the map and allow me to remember every fork in the road clearly.

I was glad that I had made the right decision, but at the same time, my mind began to clutter, as if my mind had suddenly relaxed, and my body and mind were exhausted. It was darker than the night, and I couldn't even be sure if I was still open. I pinched my thigh, and the pain woke me up from my half-sleep.

I immediately became vigilant, this was not normal. Although the tension and excitement of this journey were enough to exhaust my physical energy, there was a prerequisite for falling asleep at any time. But right now, my nerves are still tense and about to break, and there's no reason why I can't help myself to fall asleep after a moment of rest. I jerked a question mark in my mind: What's going on?

From the time we got on the embankment to the time we rushed into this passage, we were always in a state of tension and high tension, and we had no time or energy to focus on anything else. I suddenly asked myself now, and I realized that the change in the environment is really too big, and it is all-encompassing. The main factor that caused me to languish was temperature.

The biggest enemy we face on the water's edge is the brachiopod, and the second is Cryopod. We don't have a thermometer, so we can't measure the exact temperature, but from experience, I can tell that the temperature is at least below five degrees Celsius. After entering the passage, we were first exhausted and desperately running, and then we were frightened by the loss and strange events, and our perceptual nerves were numb. Now I realized that the temperature in the tunnel was much higher, and I didn't feel too cold with my bare feet, and of course it was cold. If you go barefoot on the embankment, you will freeze.

I can understand that the inside and outside of the passage are the same geological formation, and the temperature is kept constant, but the temperature difference is so large that it is difficult for me to understand. One temperature requires people to constantly increase the amount of exercise to resist the cold, and the other temperature makes people drowsy, the difference between the two temperatures can be imagined.

I was worried that I would fall asleep if I continued to sit here, so I decided to leave right away. One of the benefits of having the right temperature is that we will have a reduced intake of food, which will prolong our survival time. I heard even breathing on both sides, and knew that the two warriors were already asleep. I slapped them both awake with all my might, and kept shouting: go, go.

Platoon Commander Zhao was woken up by me and pretended to be alert and said, "I almost fell asleep." ”

I don't bother to sarcastically mock him: it's almost snoring.

PS: Tomorrow is Monday again, time flies so fast. New friends don't understand my update rhythm, here is a clarification, keep two updates every Monday, and other times if there is no prompt, it is one update. Thank you for the reward of the blue tarot card, and thank you friends for your support. Thank you for your continued support and widespread promotion of this book.