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on the morning of september 12, a netizen posted a video on xiaohongshu: at 7 o'clock in the morning, i saw a "water monster" in the qiantang river. at around 6:50, it first swam straight from the third bridge to the fourth bridge. i thought it was an underwater model toy, but later i found that it swam back to the third bridge and circled around the third bridge several times. it looked like a big fish.

in the video, a dark shadow in the center of the river sometimes surfaces and sometimes sinks into the water, moving at a relatively fast speed. a small boat also passes by the dark shadow.

many netizens left comments in the comment area. "it may be our company's unmanned boat. don't worry, we often test the qiantang river." "why is there no water mark or waves at all? it's a bit strange."

gu weidong, deputy captain of the fisheries law enforcement team of the hangzhou municipal agriculture and rural affairs bureau, said:the object in the video is blurry, just an outline, and it is difficult to tell what it is at the moment. but based on the small boat passing by, the object is probably 7 meters long.

"the finless porpoise is only about one meter long. judging from the size of the object and its swimming habits, it is unlikely. a finless porpoise cannot swim that fast."

gu weidong said that some underwater submersibles will undergo navigation tests before they are officially delivered and used, and some may be underwater submersibles that are being tested or operated.

staff from the qianjiang port and shipping law enforcement brigade said that they had watched the video and later retrieved the shore surveillance footage, but the object was too small in the video and they couldn't make out what it was even after watching it for a long time.

"under normal circumstances, testing work on the qiantang river, such as studying the qiantang river tide and other hydrological data, requires the use of tools such as detectors, and also requires application and filing with relevant departments. if it is non-living matter, it is definitely not allowed in the main channel and is considered an obstruction to navigation."

mr. wang, who is engaged in the research and development and sales of underwater equipment, told reporters that the objects in the video are indeed blurry, but they are most likely not living creatures and look quite similar to underwater robots.

"underwater robots come in all shapes and sizes, from one to two meters long to more than ten meters long. there are many types and their functions are also different. generally, they are deployed into the sea to measure water temperature and quality and to scan the terrain."

mr. wang said that underwater robots do need to be tested before they are deployed, but many manufacturers have test sites, usually in lakes.

"underwater robots don't need to be manually controlled because there is no signal underwater. generally, the parameters are set at a certain launch point, and then it is allowed to run by itself and retrieved after running." mr. wang said that if it is an underwater robot, there must be a launch point, which may be a crane or a workboat. according to the size of 7 meters, it may weigh several hundred kilograms, and it will not be easy to launch it.

(the picture shows an unmanned autonomous underwater vehicle, provided by tianjin hanhai lanfan marine technology co., ltd.)

tang chenchen, reporter of chengshi interactive and metropolis express