At 5 o'clock in the afternoon, the 10 teams that went out to investigate gathered at the headquarters on time.

The temporary base outside has been completely dismantled, and all the technicians have been evacuated in special operations vehicles in an orderly manner, and this is the foothills, and they only need half an hour to leave the danger zone.

In the headquarters, Xu Da is making the final combat deployment.

"1 group 2 groups bring a box of grenades to the No. 1 channel, 3 groups of 4 bring a box of grenades to the No. 2 channel, 5 groups of 6 bring a box of grenades to the No. 3 channel, arrive at the designated place and stand by, 5:20 must be detonated on time, completely and completely destroy the channel. After completing the mission, immediately join up with the main attacker. We'll attack Main Passage 4 as soon as you detonate it. Do you understand? ”

"Understood!"

"The action begins!"

More than 40 masters of the Xuan War Department quickly divided into 4 directions, and the hour was in the night.

A woodland 1 km away from the No. 4 main passage, Qin Yi and the others are really hidden in it.

"There are still 5 minutes left, and when the battle begins, I will first solve all the sentry posts in the cave and the passage, and Minister Xu will lead people to quickly occupy the passage, and arrange grenades, just in case."

Qin Yi had already roughly explored the situation of the main passage before, just one main passage, at least 4 open sentinels and 10 dark sentinels, although the cultivation did not reach the innate level, but they all carried firearms, even heavy machine guns. If you only rely on the people of the Xuan War Department, it will be difficult to take it in a short time.

Fighting in a narrow passage, the power of the heavy machine gun, even Xu Da and Zhong Liang, who were born on the 4th floor, could not withstand it. Can you block 1 bullet, block 10 rounds, but what if it's a 50-round, 100-round round of a heavy machine gun? If there is no place to hide, they will only be beaten into a sieve and will surely die.

At 5:20, three muffled explosions sounded at the same time, and Qin Yi's figure kept flashing away.

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A faint golden light instantly appeared at the entrance of the cave, and the heads of the four gun-wielding guards on the left and right immediately snapped back, killing them instantly. Before the corpse fell, Qin Yi had already disappeared into the cave, and Xu Da and Zhong Liang, who arrived later, caught it and put it aside, and the cooperation was just right.

The main passage was less than 400 meters, and in less than 1 minute, Qin Yi quietly solved all the sentry posts in the passage.

"There is monitoring at the entrance of the cave, and I will go first to solve the fire point."

Qin Yi said lightly, and didn't care about the people in the Xuan War Department behind him, the enemy was dark and I was clear, and the other party also had an unknown number of thermal weapons, so they had to fight quickly.

The heavy metal gate that led to it suddenly exploded, Qin Yi flashed by, his figure kept flashing around, and a few gunshots and loud shouts suddenly stopped as soon as they rang out.

As soon as Qin Yi had finished clearing all the firepower points near the door, his divine sense caught a black shadow coming straight towards him from the side. Qin Yi turned around and threw a punch, just in front of the opponent's punch.

The furious true qi instantly exploded around the two of them.

Qin Yi's figure flew backwards and retreated directly to the door, and the black shadow was even more unbearable, breaking several raised stone pillars one after another before stopping. But the strange thing is that he actually got up immediately, as if he was not injured, but he did not continue to attack for the time being.

"Huh? Divine Consciousness Attacks Are Ineffective? Cultivation is obviously not at the realm of refining gods, but he can actually block a punch of eighty percent of my strength? ”

A few questions flashed through Qin Yi's mind in an instant, and then he waved his hand to stop Xu Da Zhongliang and the others who were about to rush forward.

"The other party has a master, don't move yet, guard the door."

Although everyone was already mentally prepared, they were still a little nervous when they really encountered a strong enemy at this time.

The person who was blown away by Qin Yi was tall and thin, with shriveled skin, extremely dark yellow complexion, and although his clothes were quite neat, his breath was extremely cold. At this time, more than twenty people with the same breath quickly rushed out from the depths of the cave and gathered in front of the master.

"Exit a few people, bury all the remaining grenades in the passage, and wait for my orders."

Qin Yi whispered, and Xu Da casually ordered 5 people from the first layer of the congenital and asked them to retreat immediately.

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This underground cave is very open, extending into the depths of the mountain in a long shape, with the highest place at least about 40 meters above the ground and the lowest place at four or five meters. The ground is uneven, and every few tens of meters, there is a thick stone pillar supporting the top.

The entire cave space is only equipped with simple electrical facilities near the cave passage, and the thick stone pillars inside are scattered with some diamond-shaped blue crystals of different sizes. It is these hedrons that make the whole cave look quite open.

Because of the blow just now, the double reversal stopped temporarily. Qin Yi looked at the other party, the master just now should be the leader of the Nine Yin Sect, and at this time, all the people of the Nine Yin Sect gathered together, almost 30 people. In addition to the Nine Yin Sect Master, who should be a congenital 6-layer cultivator, the rest actually has 1 innate 5-layer (deputy sect leader), 3 innate 4-layer (apologetic elder), and the others are all innate 1 to 3 layers. On the side of the Xuanzhan Department, a total of 20 people have only come in, counting the foreign aid of Dashan, there are only 5 congenital 3 layers, and 2 congenital 4 layers.

The difference in strength is very obvious, if it weren't for Qin Yi's blow just now to suppress the Nine Yin Sect Master, it is estimated that these people in the Xuan War Department would have been lying down by now.

Qin Yi's brows furrowed, and then he commanded:

"Don't separate for a while, just gather around the door to fight a defensive battle, and all the 3-4 layers of cultivation are on the periphery."

"Understood, senpai."

The people of the Xuan War Department quickly adjusted the formation.

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Ouyang Qian was the third leader of the Nine Yin Sect, and after only 50 years of cultivation of the Nine Yin Sect, he had reached the realm of the innate 6-layer Great Perfection. He originally planned to impact a higher realm, but firstly, it was really difficult to find a place suitable for cultivation, and secondly, the security management of the alliance was becoming stricter and stricter, and there were fewer and fewer boys and girls sent in from outside, plus the people who cultivated the Nine Yin Martial Arts did not like the sun very much, so in recent years, although his cultivation had not progressed for a long time, he still stayed in his lair honestly.

Ouyang Qian had actually received the information about the alliance's assault against the Nine Yin Sect, but he was very confident in his strength, and it was impossible for the alliance to use strategic weapons to attack his lair, even in the face of strategic weapons, it was not too difficult for him to escape.

When Qin Yi broke in directly, Ouyang Qian didn't care about it at first, fast speed didn't necessarily mean powerful. But after punching Qin Yi, his expression began to become solemn.

Qin Yi also attached great importance to Ouyang Qian's strength. Obviously, he is a congenital 6th layer cultivator, but he is not afraid of his own divine sense attack. In this world, there shouldn't be that kind of magic weapon that can make people ignore the divine sense attacks of god refining masters, right? Qin Yi didn't see any jewelry or anything like anything on Ouyang Qian's head or neck, and the root cause was in the exercises he cultivated.

"Minister Xu, Minister Zhong, I'll make a sneak attack in a while, see if I can kill some people first, you guys guard here, if you really can't stand it, let the people in the passage blow up the passage, and you must not let them leave."

Qin Yi made a move in an instant, his figure flashed, and he appeared directly on the top of the head of the Nine Yin Sect's innate 5th layer, his divine sense locked on him at the same time, and his right foot stepped fiercely on the top of his head.

"Get out of the way, you go and clean up those people at the door, the cathar elders stay, and kill this person first with me."

With Ouyang Qian's loud shout, the battle started instantly.