Ye Tian and Walker have been going down to the bottom of the pit and entering the secret passage for about ten minutes, and the two of them have been digging in the secret passage.

Bishop Kent and David, who were standing at the edge of the pit, only saw buckets of sand and gravel and soil constantly being transported out of the secret passage by Walker, and then hoisted to the ground and transferred out, but Ye Tian was never seen.

As for the four Germans, before going down to the bottom of the pit, they were invited out of this basement by Ye Tian for safety reasons, so they could only stand at the door of the basement, stretching their necks and looking inside.

Finally, the remaining sand and gravel in the secret passage were cleared out, and a mottled semicircular stone door appeared in front of Ye Tian and Walker's eyes.

It is not so much a stone gate as a few pieces of granite put together that are more appropriate and accurate.

This stone door is mainly made of four granite slabs, or granite strips.

In the crevices between and around these four granite rocks, many stones of different sizes are filled, plus some residual sand and gravel soil, which together seal this secret passage.

After cleaning up the sand, gravel and dirt in the secret passage, Ye Tian took a step forward and began to explore the mottled stone door, as well as the floor of the secret passage, the walls on both sides, and the vault above.

After some investigation, he found no hidden traps, and the stone door seemed to be safe.

However, it is still unknown whether there are traps behind the stone gate or whether there are hidden dangers.

Of course, this is for others, what is the specific situation behind the stone gate, Ye Tian knows better than anyone else.

After pretending to investigate carefully, Ye Tian said:

"Walker, you bring the Pulsed Metal Detector and probe this stone door again, I didn't find any traps on this stone door and in this secret passage where we were.

But if there is a trap behind it, it is better to be careful, if there is still no metal signal detected, let's chisel open this stone door and see what secrets are hidden behind it!"

"Okay, Steven"

Walker answered, then put down the sapper shovel in his hand, picked up the pulse metal detector that was set aside, and stepped forward to begin the detection.

The result came out in a blink of an eye, and the metal detector did not sound.

Behind the stone door, Walker did not detect any metal objects.

Or rather, there are no metal objects present at the Pulse Metal Detector's detection range of more than six meters.

As soon as Walker finished probing, Ye Tian picked up the walkie-talkie and said:

"Derek, you put a hand-held drill down, and we're going to clean the stones from the cracks in this stone door, and then break open this stone door to see what secrets are hidden behind the stone door."

"Okay, Steven, let's put the rig down right now"

Derek, who was standing at the edge of the pit, replied loudly, and he was about to fly with excitement.

In the blink of an eye, a hand-held drilling rig was hoisted down and picked up by Walker, who was standing at the bottom of the pit.

Immediately after, Ye Tian's voice sounded again, clearly reaching everyone's ears.

"Let me inform you that we have cleaned up the sand, gravel and dirt in this secret passage, and we are currently standing in front of the stone gate that blocked the secret passage, there are no traps here, at least not outside the stone gate.

This passage has been closed for at least a few decades, and it is unknown if there are other exits and vents, and the air inside is likely to be dirty, so everyone wears protective equipment for safety.

Derek, don't forget to inform the guys outside the basement door, as well as the German friends, to wear protective equipment as well, just in case, I don't want to see an accident happen."

With his words, everyone immediately took action to quickly check their protective equipment to see if the sealing performance was intact, so as to eliminate the possibility of accidents.

Deep in the secret passage at the bottom of the pit, Ye Tian took the drill rig from Walker's hand, and then observed the mottled stone door in front of him, and then raised the drill rig and began to clean up the stones that filled the gaps.

In the next moment, a shrill noise came from the secret passage, resounding throughout the basement.

Although the sound is very harsh and makes people get goosebumps, at this moment, this noise reaches everyone's ears, but it becomes music, with its own rhythm.

It didn't take much effort, and the stones that filled the gaps and edges of the stone gate were all broken by Ye Tian with a hand-held drilling rig and cleaned out.

With his movements, the four large pieces of granite that made up the stone gate had obviously loosened a lot.

The foul air that had accumulated behind the stone door for decades spilled out little by little along the cracks that had been cleared, and quickly spread to the entire basement.

Fortunately, everyone is wearing protective clothing and gas masks, so there is no need to worry about inhaling the foul air and causing some accidental injuries.

After cleaning up the stones that filled the gaps, Ye Tian handed the hand-held drill to Walker behind him, and said to this guy:

"Walker, you exit the passage with the rig and the Pulse Metal Detector, and stand at the bottom of the pit outside the passage, preferably not facing the entrance of the passage, I'm going to pry open these pieces of granite, that might trigger the trap"

"Let's do it together, Steven, I can give you a hand"

Walker continued, looking eager to try.

"No, the space here is limited, and it is troublesome when there are many people, which is not conducive to dodging, I plan to pry open a piece of granite first, and see the situation behind the stone door, the remaining two pieces of granite can be used as a barrier"

"In that case, then you should be more careful, I will stand on the side of the entrance of the secret passage, and I can come in at any time to help"

With that, Walker exited the tunnel, taking the hand-held rig and pulsed metal detector with him.

Although Walker withdrew from the secret passage, Ye Tian did not immediately move to pry the few pieces of granite that looked unusually heavy, but stood quietly in place, observing this stone door.

He was waiting, waiting for the foul gas to dissipate a little bit in the secret passage before he started.

This secret passage has been closed for decades, and God knows if there is a lot of biogas in it, and if there is a lot of biogas in it that has nowhere to be discharged, it is tantamount to killing yourself.

After waiting for about seven or eight minutes, he felt that the air behind the stone door was almost replaced, so Ye Tian picked up the crowbar, and then inserted the crowbar into a gap that was two fingers wide, ready to start.

Next, he grasped the crowbar with both hands, which was more than a meter long, and began to slowly exert force, priing a piece of granite in the upper right corner of the stone gate, which was also the smallest of the four granite pieces that made up the stone gate.

In front of Ye Tian's almost terrifying power, even though the granite was very tightly embedded, and it was even about to grow with the secret passage wall and the other two pieces of granite, it was still pried.

With a piercing grinding sound, the heavy and abnormal granite was pried out little by little.

Two or three minutes later, the piece of granite, which was fifty or sixty centimeters thick and weighed one or two hundred kilograms, had been pried out by Ye Tian and fell straight to the ground.

At the moment when the granite was about to fall to the ground, Ye Tian clinged to the wall on the left side of the secret passage, like a bolt of lightning, and quickly rushed out of this secret passage.

When he rushed out of the secret passage and flashed to the side of the entrance to the secret passage, the granite also fell and slammed into the ground of the secret passage.

"Bang ——!"

Suddenly there was a loud bang at the bottom of the pit, which shook the entire basement.

Fortunately, apart from this loud noise, there were no other sounds, such as gunshots and explosions, which made everyone somewhat relieved.

As soon as this loud noise fell, Ye Tian couldn't wait to say:

"Derek, put a drone into the secret passage, go through the big hole I pried open, fly into the back of the stone door and take a look to see what secrets are hidden behind the stone door"

As soon as the order was issued, a drone that had been prepared for a long time was immediately released, fell from the mouth of the pit, and flew straight into the secret passage that had been opened.

In the front end and belly of this small drone, there is a strong searchlight, and the belly, top and surroundings of the drone are equipped with many high-definition cameras.

In the blink of an eye, the small drone had already passed through the big hole that Ye Tian had pried open and flew deeper into the secret passage.

Immediately after, an excited voice suddenly came from above the mouth of the pit.

"Behind that granite door, there is a very complete passage that slopes downward, and the flatter you go along it, the flatter the ground becomes.

About four meters through the stone gate, the secret passage turned to the left, and when it turned the corner, the secret passage became flat and even taller."

As soon as he said this, the guy who was controlling the drone suddenly paused, and then exclaimed.