Kevin Martin was immediately embarrassed, and his friends around him all burst into laughter.

After determining the direction, a group of strong men began to operate those small excavation tools and started digging.

This small excavation tool relies on an electric motor as its power source, so the noise is not very loud. When it is started in the basement and the basement door is closed, basically no movement can be heard from above. Once it continues to dig down to a depth of seven meters, there is no movement at all from above because of the seven-meter-thick soil layer.

This machine has a retractable horizontal fixed frame that can be extended up to two and a half meters. There are ground anchors under the frame for fixing. Four downward spiral drill bits drill directly downwards and the frame can be fixed in a few minutes.

As for the spiral drill used for horizontal excavation, as long as the motor is started, the spiral drill can break the soil layer in front and continuously bring the soil in front to the back through the spiral iron sheet at the back.

As long as there are no rocks or the like ahead, this excavator can dig a hole with a diameter of 40 centimeters and a depth of two and a half meters horizontally in just twenty minutes just by digging in the soil!

However, a diameter of 40 centimeters is obviously not enough. At least four such holes must be dug on a plane that is one meter wide and one and a half meters high to meet the requirements. After the holes are dug, the soil between the four holes must be dug with an engineering shovel to form a real passage that is one meter wide and one and a half meters high.

By then, by setting up supports inside the passage, the stability of this underground passage can be completely guaranteed.

In other words, if two such excavators were used to dig at the same time, they could dig two and a half meters in about an hour. A length of 60 meters could be dug in two days at most. If they did not want to prevent outsiders from hearing the construction work in the dead of night, they could dig out this underground passage in more than a day if they worked around the clock.

Of course, it is impossible to just dig, after all, the excavated soil also needs to be processed, so after a few people discussed it, they decided to just work during the day and in the evening. If they work for fourteen hours a day, they can still dig more than thirty meters.

As for the night, it is used to deal with the excavated soil.

The soil was easy to handle. Morris bought a second-hand Toyota pickup truck at a local underground black car market. He put the excavated soil directly into snakeskin bags and temporarily piled them in the yard of the small building. When it was late at night, the pickup truck would run a few times and throw the snakeskin bags filled with soil directly into the small lake more than 500 meters to the east.

Anyway, there was no one around the small lake at night, which was the most suitable place for doing this kind of thing. Bruno had already made preparations for this matter in advance and knew the situation of the small lake very well.

In this way, some people were digging holes, some were transporting soil, and some were setting up scaffolding. These people cooperated well and spent two whole days to finally dig this underground passage to the predetermined coordinate location.

It was exactly ten o'clock in the evening of the second day after the excavation began, but there was no distinction between day and night in the tunnel. It was always daytime - there were lights in the tunnel.

Looking at the wall made of rocks and cement in front of him, Yang Jing smiled with satisfaction. Here, with the Sky Eye skill, one can even see through the wall to see the situation on the other side.

"Yang Jing, behind this wall is where the Japanese hid their treasure?" Gege stood behind Yang Jing with a slight bend in the waist. She could only stand behind Yang Jing. It was difficult for two people to stand side by side in such a narrow underground passage, and the height was also limited. They could only stand in line one by one with bend in the waist.

Yang Jing, who was also bending over to look at the wall, nodded and said, "That's right, otherwise how could such a man-made wall suddenly appear here? Obviously, the Japanese knew that the treasures they looted from Southeast Asia could not be transported back to their homeland, so they could only hide them on the spot. I estimate that the value of this batch of treasures should be very high, so the Japanese built such a basement under this church to hide the treasures, and then filled up the passage that originally led to here, so that no one would know about this place except the Japanese who buried the treasure at that time."

"These little Japanese guys are really good at hiding!" said the princess unhappily.

"Haha, in fact, thanks to their good hiding, how could these treasures fall into our hands? Well, let's break through this wall right away and see what treasures the Japanese hid here!"