When Zhao Yu left Beigang City and returned to the Qixing hanging coffin, it was already more than 3 o'clock in the afternoon.

As for the matter of arresting the suspect Bai Lang, he had already handed it over to Captain Fang Kaiyu to deal with, and as for the interrogation of the funeral home staff and the search for Bai Lang's accomplices, he was given carte blanche to Wu Xiumin to preside over it.

Therefore, at this moment, it was still Xiong Wendong and other police officers who accompanied Zhao Yu back to the cliff of the Seven Star Hanging Coffin.

Through prior arrangement, when Zhao Yu and the others arrived, there were already several local boatmen who often run boats, as well as professional engineers of ships, waiting there.

Although the exact form is not yet known, Zhao Yu is now more inclined to the speculation that the criminals used the boat to put the body in the hanging coffin.

He believes that the criminals can completely modify an ordinary ship, and then add a set of lifting machines in the cabin, or simply drive the lift truck to the ship, so that the purpose of lifting can be achieved!

However, in order to test this possibility, he still called in local boatmen and professional ship engineers to discuss with them.

This section of Baisha River under the Qixing hanging coffin is more than 30 meters wide, although there is sediment on both sides of the river, but the middle part is still some depth.

Therefore, there are also many ships passing through the Baisha River, but most of these are cargo ships carrying goods.

At this moment, in order to see more clearly, the local police arranged several simple wooden boats, and Zhao Yu and others took this kind of wooden boat to the bottom of the cliff.

While observing the hanging coffin on the cliff wall, we discussed the method of transporting the corpse.

When viewed from below, the cliffs are almost 70 meters high, which is even more majestic.

Because the cliff wall is inclined inward from top to bottom, it looks like there is a sense of oppression that the building is about to fall, and people are a little dizzy to see.

"Officer......" At this time, a young engineer wearing glasses spoke, "I calculated according to your idea before, and I feel that it is still very difficult to use the lifter!"

"Oh," Xiong Wendong hurriedly introduced to Zhao Yu as soon as he saw this person speak, "This is Wang Rong, an engineer of our Songzhou Shipping Company!"

Zhao Yu nodded, as if he had said hello.

"Officer!" Engineer Wang pointed to the river under his feet and began to expound his theory, "The main difficulty is the problem of eating heavily.

"Look...... This side of the river near the cliff wall is a mud and sand shoal, and boats in the river must be avoided far away, if they get too close, they will encounter the danger of running aground!

"Look at ...... again," he said, pointing up at the hanging coffin above, "the hanging coffins are all at a height of 20-40 meters, and if we make scientific hypotheses, we must take the highest 40 meters as an example."

"Such a high height would never have been possible with a scissor lift or lifting platform like the one used in the construction of street lights with modern lifting equipment.

"All that's left is a hydraulic lift or a ladder fire truck for the fire brigade......"

Oh......

Listening to Engineer Wang's explanation, Zhao Yu couldn't help but admire in his heart, he deserves to be a literate engineer, he speaks logically and hierarchically, and he listens very clearly.

"Let's start with the hydraulic lift, which relies on a hydraulic cantilever to achieve high-altitude work!

"As far as I know, the most advanced elevator can reach about 30 meters," Engineer Wang continued, "and the cantilever is more extensible, even if the boat is parked in the middle of the river, the cantilever can still extend to the cliff wall."

"That way, the boat doesn't have to worry about getting too close to the edge of the cliff and running aground.

"But ......," he said suddenly, "taking a lift truck of this level as an example, not only is it huge, but it also weighs about 20 tons, plus the mass of the hull itself, it is impossible to sail in the Baisha River!"

"Yes, how wide is the Baisha River...... a boatman immediately echoed, "The water in the area of Kongjiawan is very shallow, and such a big boat can't drive it at all!"

"Yes, the Baisha River is not as big as those big rivers," said another boatman, "and our company basically controls about 10 tons of sand and soil!"

"So...... What about the fire ladder?" asked Zhao Yu.

"That's right, that's the point I'm going to talk about......," Engineer Wang said, "The ladder fire truck is used by the fire brigade to save people, because the purpose and function are different, so the fire ladder is more concise."

"As far as I know, the world's tallest ladder fire truck is made in Finland and can be raised up to 110 meters.

"Now the mainstream equipment of the fire brigade in big cities can also reach more than 50 meters!" Engineer Wang said, "Moreover, the ladder is in the form of erection, which can also be used to reach the hanging coffin without being close to the cliff!"

"Oh...... In that case...... Doesn't that mean that the coffin can be closed?" Xiong Wendong said, "The criminal, did you use the fire ladder to put the body into the hanging coffin?"

"But......" Engineer Wang frowned and said embarrassedly, "There are two problems, which still exist objectively!"

"First, it's still a matter of eating weight! A ladder that can rise to about 50 meters, although its weight is smaller than that of a hydraulic lift, is not much smaller! At least it is about 15 tons.

"With such a weight, we can barely move during the most abundant time period of the Baisha River......," he waved his hand, "The Baisha River is at its most abundant in July and August every year, which is a very short time!"

"Well......" Zhao Yu nodded, "The hanging coffin case all happened after September last year, this inference really can't be established......! What about the second problem?"

"Second," Engineer Wang replied, "the ladder fire trucks are all specially customized, and their prices are very expensive! Take the kind of ladder that I said can rise to 50 meters as an example, the cost of such a ladder truck is about 10 million yuan!"

"Moreover, because of the singularity of the purpose, except for the fire brigade, no other unit will spend money to buy it!"

"Then ......," Xiong Wendong said busily, "will it be ...... They rented it from the fire brigade......? I'll call and ask!"

With that, Xiong Wendong hurriedly ran to the stern of the boat to make a call.

"I feel ......," said Engineer Wang, "whether it is Songzhou or Beigang, there should be no ladder fire truck of this level!

"And ......," Zhao Yu shook his head and said, "The fire brigade may not be able to borrow it, and criminals won't dare to borrow it?"

"The key is ......," Wang Rong said, "even if you can get a ladder truck, the problem of heavy hull still can't be solved!"

"Officer Zhao!" At this time, Xiong Wendong shouted from the stern, "I asked, our fire brigade here doesn't have such awesome equipment at all!"

"They told me that in the entire province of Fulai, I am afraid that only Xiakou City, and the provincial capital Fulai City! Moreover, there are not many, and it is absolutely impossible for the fire brigade to rent them out!"

Wang Rong glanced at Zhao Yu, which meant to say: How is it? It's the same as what I just said, right?

"But ......," however, Zhao Yu did not mean to be discouraged, and said, "It doesn't matter whether the hull is heavy or not, or what kind of equipment they use......

"But one thing is certain! If they really use the ship to place the corpses, then their ship must be very big and different, right?"

"Oh...... You're so right!" Wang Rong instantly understood what Zhao Yu meant, and hurriedly said, "Panjiawan Bridge, as well as Songzhou Wharf, all have monitoring probes for the Baisha River!"

"And we...... There is already an approximate time for them to place each corpse!" Zhao Yu nodded to Wang Rong and said, "Engineer Wang, this time, I have to trouble you to do me a favor! Help us find out that special ship!!"

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