Talk about not meeting teammates in Guangxi

Diving is a small and dangerous sport. Although diving accidents occur frequently, it is difficult to prevent people from diving into deep seas and caves again and again in order to explore unknown underwater scenery.

In Guangxi, there is a mysterious "bottomless deep pool" with complicated underwater terrain. A group of experts and diving enthusiasts studied it. So far, no one can tell how deep it is, and this mystery has attracted more people to explore.

But many people seem to ignore the danger of this "deep pool" when exploring the unknown. In the "115" diving accident in Guangxi, a female diver from Chongqing was killed here, which may give more warning.

As we all know, Guangxi Zhuang Autonomous Region has famous karst landforms. Many caves, sinkholes, deep pools and hidden lakes have been formed in Baishan Mountain in Guangxi due to the dissolution and precipitation of soluble rocks by groundwater and surface water and the action of gravity.

Du 'an Underground River National Geopark in Du 'an County, Guangxi Province is a geological relic park integrating karst underground river, karst landform relics and water landscape in karst area. The Sudi underground river in the park is the largest underground river system found in the world at present, and it has also created a bottomless "mysterious deep pool"-Bading Beach.

The villagers nearby are in awe of Bading Lake, because it looks small on the surface, but it actually presents an inverted funnel shape with curved branches under the water. The terrain is complex and bottomless. So far, no one can tell how deep Lake Bading is.

Experts explained that Bading Beach may be a "small skylight" filled with water above the Sudi underground river.

Long-term rainfall leads to the continuous expansion of the sinkhole and the continuous downward cutting of the underground river, which leads to the collapse of the ceiling and the formation of a deep pit connecting the surface. When the groundwater level is close to the surface, the bottomless Bading Lake is formed.

Experts said that although divers only dive to the depth of 100 meters, due to the particularity of Caster landform, rainwater will continue to dissolve along the surface cracks, forming more downward extending holes. To some extent, Bading Beach is indeed bottomless.

Due to two "dangerous factors", Bading Lake is bottomless and the terrain is complex, which attracts many divers. People keep diving and exploring, trying to discover more unknowns.

20 1 1, divers found the "giant panda in the water" peach jellyfish in Bading Lake, which is a paleontology with high requirements for water quality and rare in the world. Since then, Bading Lake has also been called "Peach Blossom Jellyfish Skylight".

After that, more people went diving in Bading Lake, and unfortunate diving accidents followed.

According to the official report, on June 5438+065438+1 October 55438, five members of a diving club in Nanning, Guangxi, went diving in Badingtan together. At noon 12, four of them went into the water and the other1was guarding the equipment on the shore.

10 minutes later, two of the four people who entered the water surfaced. After discovering that two companions failed to come up, they dived again for search and rescue.

At about 1 in the evening, two people found their companion's 1 and floated together. A female diver in Chongqing is missing. 1 hour later, several people called the police, and the search and rescue personnel of Duan Lan Qi Rescue Team rushed to the scene.

In charge of the search and rescue operation are Sir Dong, a top expert in diving, and Lao Mao, who set a diving depth record (202 meters) for China divers in June+10, 5438.

They said that diving in Bading Beach was very difficult, but the visibility of Bading Beach was not good in June 5438+065438+1October, and the risk factor doubled.

That night, the search and rescue personnel launched a search and rescue operation in the water, because the only possibility for female divers to survive was to be found in the air chamber of the underwater cave, so they searched the air chamber first.

The so-called air chamber is a space with a lot of air in an underwater cave. If the diver is in the air cabin, he is more likely to survive. Unfortunately, after searching, Bading Lake coexisted in such a space underwater, and the search was fruitless.

As we all know, the possibility of missing persons surviving is very small, and their "search and rescue operation" has actually become an operation of "salvaging the remains".

Due to the complex terrain of Bading Beach, the depth of its lower part is between 1 10 m-160 m, and the underwater area is vast, with many hidden holes and gullies, and the visibility is poor, so even experienced divers are full of risks in searching in the water.

So divers can only search in the upper part, and the lower part can only be searched after the underwater remote control robot arrives.

From the night of165438+1October 15 to 19, the search and rescue personnel took turns to go into the water, and almost all areas over 90 meters in Bading Lake were searched. No missing diver was found. People understand that the next best thing is to successfully salvage her body ashore.

165438+ 10 19 On the evening, the underwater remote control robot finally arrived at Bading Beach. After robot search, the remains of the victims were found at Badingtan underwater130m (actual rescue depth143m).

It is extremely difficult to salvage the remains at this depth, and the fishermen themselves may die if they are not careful. There is a debate among searchers on the question of "fishing or not".

Some people think that the risk is too great and meaningless, so we can try to salvage by underwater remote control robot. However, this plan was abandoned because it was difficult for the robot to complete the puncture and bring the remains of the victims ashore from the depth of 140 meters.

Seeker explained that with the increase of diving depth, the underwater pressure will also increase. When a diver ascends, the gas dissolved in the blood will be eliminated with the blood circulation, but once the human body dies, the gas will not be discharged by itself.

The depth of underwater140m means that the pressure there is 15 atmospheric pressure. That is to say, once the corpse goes ashore, the gas in the body will expand 15 times, and the corpse may "explode" directly.

Therefore, in the process of floating with the body, it is necessary to "pierce" a specific part of the body with a sharp instrument to release the gas in the body, thus ensuring the integrity of the body after landing.

After many discussions, the searchers finally decided to go into the water to salvage. They decided to use underwater robots to illuminate the remains, while divers dived into the depth of140m to bring the remains ashore.

Thanks to the efforts of the search and rescue team, except that the body was "hung" on a steep slope of more than 70 degrees, the search and rescue personnel had to temporarily change the salvage procedure, and the whole salvage process went smoothly.

After salvaging the body, the search and rescue personnel carried out puncture at the water depth of 105 meters, and then successfully brought the body back to the shore. At this time, it was165438+1October 2 1, and nearly a week had passed since the diver was killed.

This unfortunate diving accident made many people feel sad, but what everyone wants to know is why such a tragedy happened.

According to the data analysis of the diving watches of the victims by the search and rescue personnel afterwards, the possible incident process was restored. According to the analysis of search and rescue personnel, the female diver may be separated from her teammates about 3-6 minutes after launching, when her diving depth was 34 meters.

According to the feedback from the diving instructor and other divers who returned smoothly, they swam from east to west along the wall of Bading Lake after launching, then dived to 34 meters and then turned back and floated. At this time, some people have found that their companions have been separated. Therefore, it is speculated that the victims did not turn back with the team, but mistakenly entered the caves in the north.

Later, she gradually explored the north, probably to find her teammates, but in fact, the water depth in this area gradually increased and the danger level was rising.

According to the standard operation of diving, if you get separated from your partner and look for 1 minute in the same place without results, you should return to the surface. But the female diver didn't do that. We can't guess whether she forgot the operating rules because of panic, or whether she couldn't float by herself, but her panic at that time was conceivable.

Of course, the reason why the female diver didn't float up may be that she met a "nitrogen drunk" here.

The so-called nitrogen poisoning is a dangerous situation that divers may encounter. This means that when the human body is in an environment of 3-4 atmospheres, the nitrogen in the high-pressure gas cylinder will enter the blood.

This will hinder the transmission of nerve conduction and central protrusion, weaken various functions of human body, make people's reaction slow, and produce a state similar to drunkenness, so it is called "nitrogen poisoning" or "nitrogen anesthesia".

Of course, some people will have excited and nervous reactions when they drink nitrogen. Similarly, they will lose their judgment of their current situation. Moreover, environmental and psychological stress may aggravate the reaction of nitrogen poisoning, and eventually make divers lose their correct judgment.

Divers may die if they drink nitrogen in a complicated cave without timely rescue, and the female diver who died may have drunk nitrogen before diving back to the north.

Another thing that can prove this conjecture is that the diving depth recorded by the diving platform has been increasing since then. Judging from the time and depth, the female diver was almost in a state of "natural fall" at that time.

Although there was a brief floating in the middle-that may be the last struggle of the female diver-the diving watch finally showed that she stayed on the slope of underwater 140 meters, and the search and rescue personnel thought that she had already died.

This unfortunate accident made everyone feel sad, and also taught divers a profound lesson, that is, when diving, we must strictly abide by the operating rules, keep close to our companions, try to stay calm after the accident, save your strength and wait for rescue.

In fact, the enthusiasm of diving enthusiasts will never be erased, but we hope that everyone can be aware of the risks of diving, correctly evaluate their own abilities, correctly grasp the measures to deal with underwater accidents, and avoid more tragedies.

Langfang Radio and Television Station "Flowers Fall and People Die, and Xiangshan-115 Guangxi Diving Accident Rescue Story"

CCTV 10, Geographical China, Magic Cave, Underwater Cave.