This is likely to be the second layer of the cave below, Han Du immediately said to Lao Huang and Sun Zichao: "Let's look separately, there are many caves along the way, there should be a hole in the cave that leads to the second layer below." ”

The three of them immediately walked back, and there was no shortage of large holes and small holes along the way.

Soon, Sun Zichao made a discovery, ran out of a hole in a hole, and shouted: "There is another hole in this hole, and there is a deep passage in it!" ”

Han Du and Lao Huang ran out of the other two holes, and when they saw Sun Zichao smirking at the entrance of the cave where they were, he felt a little pride in his heart as the first person to make a discovery.

Han Du and Lao Huang immediately entered his hole, and the leopard kept following Han Du, and after a while, he ran out of Han Du's hole and caught up with them.

However, they hadn't walked a few steps in before Han Du suddenly stopped, and large triangular footprints appeared in front of him, larger than a person's palm.

As mentioned in the introduction to this triangular footprint mission, Han Du squatted down and put his palm on it, which was at least three times larger than his palm.

"Oh my god, what kind of monster are such big footprints? Could it be that those people outside were torn apart by this kind of monster? Sun Zichao screamed, vigilantly around, fearing that the monster would rush out and attack them.

"It shouldn't be, these triangular footprints have been many years old, it is estimated that this animal passed by when the cave was first formed, so that it could leave its footprints on the limestone, and how can this cave also have a history of hundreds of millions of years, so this animal should have been extinct long ago." Han Du was already more sophisticated, and he quickly became much more rational in his own judgment, but fortunately, he had written novels before, and he had checked all aspects of knowledge, and had a basic understanding of the formation and structure of the cave.

Therefore, Han Du's judgment is completely correct, although the hardness of limestone is not very large, it is impossible to step on it under normal circumstances, and only in the process of forming a karst cave, when there is still water on it, can it step out and leave footprints.

Since these triangular footprints were just relics with scientific research value, and there were no monsters, Han Du led the team to continue to move forward.

The three of them and one dog walked along this gradually descending passage, and Han Du walked in the front knowing that he would soon reach the second layer.

Sure enough, within ten minutes, Han Du walked to the end of this passage, but there was a hole in the ground, and the entrance was the size of a footbath, he looked inside, and it was a very smooth and curved passage, and people should be able to slide down.

Han Du was the first to jump down, feeling like he was sitting on a slide, all the way was smooth, and he made a few turns halfway.

Later, Lao Huang and Sun Zichao followed together, and the leopard found that Han Du disappeared after entering this cave, so he naturally followed his master.

More than a minute later, Han Du heard a very clear and loud sound of running water in his ears, and the person finally slipped out of this passage, the exit was very close to the ground, Han Du controlled his speed slightly, and landed on the ground very calmly, and Lao Huang, Sun Zichao and the leopard also landed one after another.

There is really a cave below, it is a very empty space, the area is the size of half a football field, the ground is more than 20 meters high from the top of the cave, and on the opposite side of the cave stone wall, a rushing underground river flows through, the water flow is turbulent, the river surface should be six or seven meters wide.

"Whoosh!"

"Whoosh!"

"Whoosh!"

"Whoosh!"

But the four of them began to observe the large space on the second floor, and in the corner next to them, a man and a woman suddenly rushed out, and the two of them seemed to be red-eyed, picked up the military bow and crossbow in their hands and shot two arrows at Han Du and them.

Fortunately, Han Du and the others were mentally prepared and avoided together, and four sharp arrows were shot on the ground.

"Captain Yu, it's us!"

Han Du turned around after avoiding it, and recognized at a glance that it was the surviving Yu Shengnan and Cui Kai, the two of them had a lot of blood stains on their bodies, and they were both injured, and their minds were already a little unconscious because they were too stimulated, Han Du called out their names loudly, and they continued to draw arrows and shoot and stopped.

"Calm down, we are not enemies."

Han Du shouted again, Yu Shengnan and Cui Kai were stunned for a moment, only to recognize Han Du, Sun Zichao and the Tibetan mastiff they had seen outside, as for Lao Huang, they had not seen it, but they understood that they must also be Han Du's accomplices.

"Why are you here?" Yu Shengnan's heart that had been tense relaxed, and she almost lost her rationality when she fought all the way.

"It's a shame to see many of your companions die outside, so let's see if you need help."

Han Du showed his intentions, Yu Shengnan and Cui Kai were very surprised, they had a conflict outside before, I really didn't think that Han Du would rush to support them, normal people should have fled long ago when they saw those broken corpses on the upper floor.

The atmosphere at the scene suddenly became relaxed, and Han Du now had a lot of questions, and said, "Okay, let's explain to us what happened first, how can you have such a big casualty?" ”

"Follow me."

This is a heavy topic, Yu Shengnan was sad, Cui Kai opened his mouth to explain, turned around and led Han Du and them to a position next to them.

From afar, Han Du saw broken corpses in one place, only this time it was not only the broken corpses of people, but also some kind of red-faced and white-haired animal.

In addition, Yu Shengnan's last two German Shepherds were also dismembered and died here.

Han Du took a look, there were a total of three heads at the scene, indicating that there were five people including Yu Shengnan who survived on the first layer at that time, and then looked at those red-faced and white-haired monsters, there were four of them, which were killed by bows and crossbows and sharp knives, and it can be seen that they were split by Yu Shengnan and Cui Kai with sharp knives after death, probably to avenge the tragic death of their companions.

"Could it be that this red-faced and white-haired monster attacked you?"

Cui Kai nodded, Yu Shengnan and Sun Zichao didn't look at you later, they just looked at them from afar.

In order to complete the task, Han Du had to understand this monster clearly, and went over to pick up the broken corpse of the red-faced and white-haired monster, and put together a finished body, about one meter and five long.

In this way, you can see at a glance why its lethality can be so fierce, because in the mouth of its red face, there are two rows of very sharp long fangs, both of which burst out of the mouth, and it is estimated that even the bones can be easily broken, and its forelimbs are longer than the hind limbs, like human hands, it is estimated that it is an animal that can stand upright or crawl, and the most important thing is that it has sharp claws on its forelimbs, which can pierce the human body at once, and it is very simple to take people's lives.

"I don't know what species this red-faced and white-haired monster is, it looks like a very dangerous animal, but how can there be so many people in your entire team who have been torn apart by them? Is there no effective resistance? ”

Han Du was puzzled, he really couldn't imagine what kind of scene the red-faced and white-haired monster would be when they attacked them.