Follow-up report on divers' underwater exploration accidents

The diver's body was found. Rescue team: It is impossible to determine whether it is a criminal case at present.

Now more and more people begin to contact and participate in diving, thinking that it can not only exercise, but also feel and explore the underwater world. According to the earlier statistics of China Diving Association, since 2006, the experience diving service in China has maintained an average annual growth of 30%.

However, on September 6th, in Panjiakou Reservoir, Tangshan, Hebei Province, two divers, a man and a woman, both disappeared while diving together to explore the underwater Great Wall. It was not until September 17 and 18 that their bodies were discovered by the machine. According to public reports, both of them are top divers with corresponding qualifications, and they can carry out underwater activities for 6-8 hours with sufficient equipment, while this activity is only 2 hours. Why were two divers killed? What problems are reflected behind this?

GUE(Global Underwater Explorers) is a global non-profit diving organization with underwater exploration as its core goal, which is famous for its rigor and high elimination rate in the diving circle. On September 4th this year, the team organized an unofficial surveying and mapping activity: the Great Wall was submerged by the Panjiakou Reservoir in Tangshan, Hebei Province, and photos and videos were taken, and the hydrogeologic map was made public free of charge.

Two technical divers of the team, Sun Hao and Xu Haiyan, disappeared in this activity. According to the Beijing News, on September 6th at noon 12, four GUE teams and two teams each carried 100 kilograms of equipment and sneaked into Panjiakou Reservoir. According to the plan, Xu Haiyan and Sun Hao will leave the water two hours later, but they will not come back until 3 pm. Subsequently, other divers of the team went into the water to search, but found nothing. On September 7th, GUE officially announced the disappearance of two divers in Panjiakou Underwater Great Wall Exploration Project, and immediately notified the local police to organize rescue.

According to the official WeChat account of the team, after the incident, the Blue Sky Rescue Team, the 9958 rescue platform and other forces participated in the rescue, using underwater robots and other equipment to search for suspicious waters, and the depth of search and rescue gradually deepened from the initial 30 meters.

The search and rescue work encountered many obstacles. GUE team revealed that there are many submerged structure in the core area of Panjiakou Great Wall, and there are blind areas for sonar detection. In addition, the situation in the incident waters is complex, the visibility under water is low, the depth changes greatly, and there are a large number of fishing nets and cages in use or abandoned by local fishermen, which leads to the entanglement between underwater robots and towed sonar for many times.

According to public reports, Xu Haiyan and Sun Hao are top technical divers, and they can dive in the water with a maximum depth of 70 meters. And when they carry enough equipment, it is enough to support their underwater activities for 6-8 hours. The maximum depth set by the diving team is no more than 50 meters, the diving time is 2 hours, and the preparation before the activity is also sufficient.

Why is there a shortage of experienced and well-equipped divers? The person in charge of the Beijing Green Boat Emergency Rescue Team revealed yesterday morning that it is impossible to judge the specific cause of the incident at present, and the results of the police investigation shall prevail. "Now it is impossible to determine whether the incident is a criminal case? Theoretically, this depth should not be a problem. Is there a problem with gas cylinder inflation? Or other liability accidents? "

At 5: 00 pm on 17 and around 18 in the morning, the GUE team issued notices respectively, saying that the remote control robot had found several decompression bottles underwater and found the images of two divers respectively. So far, the remains of two missing divers have been found, and the follow-up salvage work will be carried out in strict accordance with legal procedures.

Divers have died underwater before. According to public reports, in 20 14, a diving enthusiast disappeared while exploring cave diving at the source of Chengjiang River in Du 'an, Guangxi, and was finally found dead.

Zuo, director and diving coach of Beijing Shenhailan Diving Development Co., Ltd., said that the underwater Great Wall adventure project organized by GUE team is a technical diving different from leisure diving, with higher safety risks. The dangers that may be encountered in technical diving, "the first is the gas problem, because the mixed gas needs a computer, such as oxygen poisoning, and the proportion of mixed gas is wrong, which leads to the reaction of other gases underwater to the body. Long-term diving, physical decompression and insufficient equipment, and then personal skills. "

Ma Hucheng, founder of Qianle Company and CMAS coach of the World Diving Federation, said that due to the danger and uncertainty of technical diving, various schemes need to be formulated before diving to cope with unpredictable underwater conditions. "Technology, such as what gas is used in the double bottle? What is the target depth? What are you doing? You must make a plan. At this depth, at least three schemes must be formulated. We must make careful plans and have corresponding safety guarantees before we can engage in this kind of technical diving. "

Ma Hu Cheng expressed doubts about whether the team has a strong enough logistics team in this incident. He said that the imperfection of the logistics team is a common situation in the domestic diving industry. "One thing you didn't notice, where is his logistics team? Did he have a strong logistics team as his logistics support and rescue support after he went into the water? This may not happen to them if the corresponding plan is well done. All the logistics teams in China who are in contact with or engaged in technical diving are not perfect enough, and the software and hardware can't keep up. This is my understanding of our industry. "

How will the event be characterized in the end? What is the real reason for their accident? We will continue to understand later.