"It's simple." Old Chen said.

"Is there any way to do it?"

"Just take a reed in your mouth."

Lao Chentou means that the place where there is a knot in the middle of the reed firewood is opened, and the person is underwater, with the reed firewood in his mouth, and the middle of the reed firewood is empty, which can help breathing.

Lao Chen Tou added: "There are very few knots in the reed firewood, one section is very long, and one section is fine. Lao Chen Tou said as he picked up a broken reed firewood from the shore and handed it to Liu Dayu's hand.

Liu Dayu took the reed firewood, and Lao Chen Tou was not wrong, the knots of the reed firewood were indeed very few, and the longest section was about forty centimeters.

Luchai is indeed a very ideal and practical diving tool.

In this way, it is not only easy to conceal and not be easily discovered on the pier, but also easy to approach the victim and make it easier to leave the scene.

Liu Dayu and Chen Jie looked at each other for a moment, and they already had a preliminary conclusion about Gu Wangyue's drowning: Gu Wangyue was very likely to die from him. There are three points to support this conclusion: first, three children of the Gu Lirao family drowned, which cannot be regarded as an accidental event, and if an accidental event occurs three times, it cannot be regarded as accidental; Second, the three children of the Gu Lirao family were all found in the aquatic plants, which cannot be regarded as a coincidence; Third, Gu Wangyue was silent when she was drowning - according to common sense, Gu Wangyue should have called for help - she also had the conditions to call for help.

In order to prove the third argument correct, Liu Dayu asked Chen Jie and Han Lingling to go to the courtyards of Gu Lirao's house and He Cuilan's house to listen to the sounds.

In about two minutes, Liu Dayu asked Dong Qingqing to shout three times at a medium volume.

"Someone's coming-someone's coming-someone's coming!"

A minute later, Chen Jie and Han Lingling returned to the dock.

Chen Jie nodded at Liu Dayu, and Han Lingling also nodded at Liu Dayu.

The water area of Gujia Datang is very large, the sound is echoed, and in the early morning, there is no irrelevant noise at all, so the sound of calling for help should be very clear.

Gu Wangyue's cry for help when she was drowning must have been much higher than Dong Qingqing's voice, so as long as Gu Wangyue called for help, her mother and He Cuilan, including other neighbors, should be able to hear it.

Lao Chentou's words further confirmed Liu Dayu and Chen Jie's analysis: "If Mochizuki speaks, her mother will definitely be able to hear it, you see, there are some people standing on the other side of the river, one of them is Lao Zhangtou, I call him, he will be able to hear it." ”

Liu Dayu and Chen Jie were very interested in Lao Chen's suggestion.

Old Chen Tou made his hands into a trumpet shape, and then shouted to the other side of the pond: "Old Zhang Tou, tonight, let's have a few glasses of wine!" ”

After a while, the voice of the old man came from the other side of the river: "Okay! I'll keep the wine hot and waiting for you. Bring two fish with you - don't forget. ”

"I can't forget, the fish are ready-made."

Lao Chen Tou fishes all year round and deals with water all year round, so he should have some experience with sound. Lao Chentou's experiment further proved that if Gu Wangyue called for help, her mother and He Cuilan would definitely be able to hear that the courtyard of the Gu family and Huo Lao'er's house was only about 100 meters away from the accident site, and the accident site was at least four or five hundred meters away from the location where Lao Zhangtou was.

It's a pity that at the time of Gu Wangyue's accident, no one in Guli Village heard Gu Wangyue's cry for help.