When Zhao Yu left Bei Gang City and returned to the Seven Stars Hanging Coffins, it was already past three o 'clock in the afternoon.
He had handed over the arrest of the suspect Bai Lang to Captain Fang Kaiyu. As for the interrogation of the funeral home staff and the search for Bai Lang's accomplices, Wu Xiumin was fully in charge.
Therefore, it was still Xiong Wendong and the other police officers who accompanied Zhao Yu back to the cliff of the Seven Stars Hanging Coffins.
According to prior arrangements, when Zhao Yu and the others arrived, there were already a few local boatmen, who often ran boats, as well as professional shipbuilding engineers, waiting there.
Although the specific form was not clear, Zhao Yu was now more inclined to the speculation that the criminals used boats to put the bodies in the hanging coffins.
He believed that the criminals could modify an ordinary boat and then install a set of lifting machines in the cabin, or simply drive the lift to the boat. In this way, they could achieve the purpose of taking off!
However, in order to verify this possibility, he still found local boatmen and professional marine engineers to discuss it with them.
The Baisha River below the Seven Stars Hanging Coffins was more than 30 meters wide. Although there was sand on both sides of the river, there was still some depth in the middle.
Therefore, there were many ships passing through the White Sand River. However, most of these ships were cargo ships transporting goods.
At this moment, in order to see more clearly, the local police arranged for several simple wooden boats. Zhao Yu and the others took these wooden boats to the bottom of the cliff.
While observing the hanging coffins on the cliff, they discussed how to transport the bodies.
Looking up from below, the cliff, which was nearly 70 meters high, was even more majestic and spectacular.
Due to the fact that the cliff was slanted inward from top to bottom, it gave off an oppressive feeling as if a building was about to collapse, making people feel a little dizzy.
"Police officer …" At this time, a young engineer wearing glasses said, "I calculated according to your ideas before, and I feel that it is still very difficult to use the lift!"
"Oh," Xiong Wendong said to Zhao Yu as soon as he saw the man speak. "This is Wang Rong, an engineer from our Songzhou Shipping Company!"
Zhao Yu nodded as a greeting.
"Police officer!" Engineer Wang pointed to the river under his feet and began to explain his theory. "The main difficulty is the problem of weight.
"Look … The side of the river near the cliff is filled with sand and sand. Boats have to stay far away from it. If they get too close, they will run into the danger of being stranded!
"Look again …" He looked up and pointed to the hanging coffins above and said, "The hanging coffins are all at a height of 20 to 40 meters. If we make scientific assumptions, we must take the highest 40 meters as an example.
"With such a high height, if we use modern lifting equipment, like the scissor lift or lifting platform used in street lights, it's absolutely impossible to reach such a height.
"All that's left is the hydraulic lift or the fire brigade's ladder fire truck …"
Oh …
Listening to Engineer Wang's explanation, Zhao Yu couldn't help but admire him. He was indeed a cultured engineer, as he spoke logically and clearly.
"Let's talk about hydraulic elevators first. They rely on hydraulic cantilevers to achieve high-altitude work!
"As far as I know, the most advanced elevators can reach about 30 meters," Engineer Wang continued. "Moreover, the extensibility of the cantilever is strong. Even if the boat stops in the middle of the river, the cantilever can still extend to the cliff.
"In this way, the boat doesn't have to worry about being too close to the edge of the cliff and running aground.
"But …" He suddenly changed the subject and said, "Take a lift of this level. Not only is it huge, but it also weighs about 20 tons. Coupled with the weight of the hull itself, it's impossible to sail in the Baisha River!"
"Yes, how wide is the Baisha River?" A boatman immediately echoed. "The water around Kongjiawan is very shallow. Such a big boat can't sail there!"
"Yes! The Baisha River is not like those big rivers, "another boatman said." Our company's loading of sand and soil is basically limited to about 10 tons! "
"So … What about the fire truck?" Zhao Yu asked.
"Yes! This is the point I want to talk about … "Engineer Wang said." The fire truck ladder is used by the fire brigade to save people. Because of the different purposes and functions, the fire truck ladder is more concise.
"As far as I know, the world's tallest fire truck ladder is made in Finland and can rise to 110 meters.
"Nowadays, the mainstream equipment of the fire brigade in big cities can also reach more than 50 meters!" Engineer Wang said. "Moreover, the ladder is set up, so it can also reach the hanging coffins without getting close to the cliff!"
"Oh … In that case … Doesn't that mean we can close the coffins?" Xiong Wendong said. "The criminal used the fire truck ladder to put the bodies into the hanging coffins?"
"But …" Engineer Wang frowned and said awkwardly, "There are two problems that still exist!
"First, it's still the problem of weight! The ladder can rise to about 50 meters. Although its weight is smaller than that of a hydraulic lift, it's not much smaller! It's at least 15 tons.
"With such a weight, it can barely move during the time when the Baisha River is at its most abundant …" He waved his hand. "The Baisha River is at its most abundant in July and August every year, which is a very short period of time!"
"Well …" Zhao Yu nodded. "The hanging coffin cases happened after September last year, so this inference is indeed untenable! So … What's the second problem? "
"Second," Engineer Wang replied. "The ladder fire truck is specially customized, and its price is very expensive! Take the kind of ladder that can rise to 50 meters as an example. The cost of such a ladder truck is about 10 million yuan!
"Moreover, because of its single use, no other unit will spend money to buy it except for the fire brigade!"
"Then …" Xiong Wendong said quickly. "Could it be that they rented it from the fire brigade? I … I'll call and ask! "
With that, Xiong Wendong hurried to the stern of the boat to make a call.
"I feel …" Engineer Wang said. "Whether it's Songzhou or Beigang, there should be no ladder fire truck of this level! There are no skyscrapers in these two places at all! "
"And …" Zhao Yu shook his head and said, "The fire brigade doesn't necessarily rent it out, and the criminal doesn't dare to borrow it."
"The key is …" Wang Rong said again. "Even if we can get a ladder truck, the problem of the weight of the hull can't be solved!"
"Officer Zhao!" At this time, Xiong Wendong shouted from the stern of the boat. "I asked around, and the fire brigade here doesn't have such awesome equipment at all!
They told me that in the entire Fu Lai Province, I'm afraid only Xiakou City and the provincial capital, Fu Lai City, have it! Moreover, there aren't many of them, and the fire brigade absolutely can't rent it out! "
Wang Rong glanced at Zhao Yu, as if to say, "So? Is it the same as what I just said? "
"But …" However, Zhao Yu did not feel discouraged at all. "Whether the hull can bear the weight or not, or what kind of equipment they used …
"But there is one thing that we can be sure of! If they really used a ship to place the bodies, then their ship must be very big and different, right? "
"Oh … Yes! You're absolutely right! " Wang Rong instantly understood what Zhao Yu meant and hurriedly said. "There are Bai Sha River surveillance cameras at the Panjiawan Bridge and the Songzhou Pier!"
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