At the same time, he took out a custom-made grenade the size of an egg from the portable device on his back.

This hand grenade was called sonar. It would not explode, and it did not have any destructive power. However, after the sonar is activated, an ultrasound is sent out to scan the current environment. Through the Doomhammer soldier's standard battle tactics table, he could receive the feedback from the sonar to establish an environment model to provide a clear terrain display.

Generally speaking, sonar mines are mainly used in complex environments. For example, the tunnel in front of him.

After pressing the start button of the sonar, Zero tossed the little thing out. The special elliptical grenade hit the ground. After the red light in the center flashed three times, the sonar grenade cracked on all four sides, forming a miniature launcher. The next moment, a formless sound wave was emitted from the little guy's body. It spread in the air at a speed of 340 meters per second, quickly sweeping across every inch of the tunnel.

Zero at the same time opened the tactical table on his wrist and received the sonar feedback. There were green lines on the background of the black screen that rapidly constructed the tunnel model. All of a sudden, the complicated terrain of the mine tunnel was memorized by Su Bai.

Behind him, the sound of many footsteps could be heard. Without any further hesitation, he flew towards the depths of the tunnel.

Although this abandoned mine had been turned into a base by the thieves, with their economic and technological strength, they were unable to transform the mine any further. In addition to repairing the electrical system that was used for lighting purposes, the bandits had also built simple sheds around the mine, as well as repairing some of the mines in the surrounding area to serve as temporary parking places for supplies.

Thus, the coverage of electricity was limited to those places. As for the zero-depth mine tunnel, it was already out of the bandit's range of modification. They followed the trail into the tunnel, and once they passed the area covered by electricity, they came face to face with a black mass, as if there was no end to the tunnel.

Normally, even wolf thieves rarely entered these mines. Sander knew that these tunnels were very complicated, and because of the years of disrepair, the fixed frames of some of the tunnels had loosened, and several of the tunnels had collapsed and been sealed off. Thus, there were too many dangerous factors in the mine.

Sander made a gesture, and the members of the Wolf Team immediately dispersed, putting on night vision goggles. Even without the illumination, they could see clearly in infrared vision mode. It wasn't that the team didn't have any lighting equipment, but if they used lighting tools in the dark tunnels, they would be no different from living targets.

The mine was too quiet. Only the sound of water hitting the ground could be heard from afar. Each member could only hear their own breathing and heartbeats. The atmosphere was extremely depressing. However, they were all soldiers that had been lingering on the line between life and death for a long time. They all had strong mental fortitude and did not have any influence on the environment.

Sander, more like a patient cheetah in the darkness, cautiously allowed the soldiers to march in a V-shaped formation so that even if they attacked, they would still have time to catch up. Sander himself was at the forefront of the troop. He walked at the front, half-crouching as he landed on the ground without making a sound.

At this moment, a wave of chaotic voices sounded out in front of the team. It sounded like the sound of a metal can rolling on the ground. However, judging from the reverberation in the tunnel, the weight of the "can" was not light at all. In his night vision mode, Sander quickly saw a group of black shadows rolling over from afar. When the thing was about thirty meters away, Sander saw that it was an iron bucket.

The air smelled of diesel. Sander's expression changed as he shouted, "Dodge! That's an oil barrel!"

As the sound of his voice faded, the oil barrel exploded. Immediately, the tunnel was filled with light. The soldiers in night vision mode were blinded by the intense firelight, and Sander rolled backward from the ground. At the same time, the sound of automatic pistol shots rang out repeatedly.

Angry curses, screams, gunshots, and screams filled the chaotic music. By the time the flames had subsided and Sander had taken down the night vision goggles, three soldiers had already been shot and killed. The three soldiers were all shot in the middle of the forehead, and their positions were almost all in the same spot, showing the superior shooting skills of the enemy.

Sander cursed under his breath and roared, "Take down the night vision goggles, all of you light up your guns! You guys be careful, the opponent is a cunning mouse, now, let's go kill him! "

The soldiers responded. They did as Sander had said, taking off their night-vision goggles and installing gun lights on the machine guns. This way, even though the target was obvious, he wouldn't be caught off guard by the enemy's powerful illumination.

After the equipment was changed, the members of the Wolf Tribe quickly moved behind the cover of the mine tunnel, which was similar to an abandoned mine cart or signboard. After rushing forward for 10 minutes, a figure flashed under the gun light and entered the tunnel to the left.

"Chase!" Sander yelled and scrambled into the side passage. He immediately saw the figure running forward. Without another word, Sander pulled the trigger. The machine gun in his hand immediately spewed out a flame half a meter long. The metal torrent formed by the bullets swept towards the figure like a hot whip.

"Da, da, da ~ ~ ~"

The rest of the members that caught up, without even needing to be ordered by their captains, all raised their guns and shot.

However, that figure was simply too fast. He would occasionally run on the ground and occasionally run on the walls of the tunnel. Sander and the others were always one step behind him in terms of firepower. The bullets were like bees seeing honey, but no matter how hard the bees tried, they couldn't touch the sweet honey.

As the figure reached the heart of the mine, it slightly twisted and split into another shadow. Two figures, one on the left and one on the right, moved towards the opposite tunnel, causing Sander's eyes to almost fall out of his head.

"Damn, it's an Adept!" I knew it wasn't that simple. "

Sander immediately called out four soldiers from the group, while he himself and three others followed. The two teams split up in pursuit, and Sander and his men entered the right side road. However, before he could get far, he discovered that the tunnel had collapsed and there was no one ahead of him. The debris was so tight that not even a mouse could climb over it, let alone a human. Seeing this, Sander immediately knew that he had been duped.

"Quick, quick, quick, let's go back!" Sander bellowed and commanded the team to retreat.

However, before they could run out of the fork in the road, they saw a series of fiery flashes in the tunnel ahead, accompanied by gunshots and miserable shrieks.

No more than 5 seconds had passed since the sound of gunfire, shouts, and firelight all disappeared at the same time. The tunnel ahead was dead silent, and Sander signaled for the men to keep quiet and press the lights to the ground. Maintaining this quiet way of marching, the four of them stealthily headed in the direction of the gunshot.

After walking about ten meters, Sander heard a strange time.

"Beep, beep, beep, beep ~ ~ ~"

The sound was like an electronic needle jumping, and the frequency of the sound was increasing. Sander felt something was wrong and looked around. He found a device on both sides of the wall of the mine. It was a dark square box with a red light blinking in the center. The sound was emitted by this signal lamp, and now, the frequency of the signal lamp's flickering was almost crazy.

A drop of cold sweat slid down Sander's forehead. The African man cried out, "Not good, it's a time-lapse bomb .."

Before he could finish his sentence, a flame exploded inside the black box. Sander's eyes were filled with flames!