With the two missing people found out of the cave, the ambulance helicopter had not yet arrived, Wang Xiaoxiao immediately gave the missing person who was still alive to carry out some emergency treatment.

Nan Hanfei stood at the entrance of the cave and asked Gu Yanan, "What about the poison in the cave?" ”

"Although there is a high suspicion that the metal cans contain mustard gas, further confirmation experiments will be carried out, and the next step of destruction will be carried out after confirmation."

Nan Hanfei frowned slightly, "You still want to go in and sample the metal cans?" ”

Gu Yanan patted the sampling box he was carrying, "It's already been collected, just go back to the laboratory for testing." ”

Nan Hanfei asked, "When I was in the cave just now, I didn't see you open the metal canister, how did you collect the poison sample inside?" ”

"You don't need to open the canister, mustard gas is very volatile, there is a crack at the upper end of one of the metal cans, you can collect a little around the crack, and I also collected soil samples around the metal cans, these metal cans seem to have been in the cave for years, at least for decades, the poison volatilized from that crack will penetrate into the soil around the cave, go back and test it, if it is mustard gas poison, the corresponding things will be detected in the samples and soil around the cracks of the metal cans."

Gu Yanan called Director Yang of the CDC to tell him about the situation in Qingcheng Mountain, as well as his plan for dealing with the incident, and asked for advice on the next action.

It was the first time that Lianhai City had encountered such an emergency situation, and the leaders of the CDC decided to seal the cave first and wait for the test results to come out before further processing according to the public health emergency plan.

Soon, a rescue helicopter arrived, and everyone was taken back to the city.

The two missing people, who were still alive, were sent directly to the First People's Hospital of Lianhai City for treatment.

For the three missing persons who had died, because the cause of death was determined and homicide was ruled out, the family members were notified and sent to the funeral home.

Because the five missing persons were all personnel sent by the Binhai Tourism Development Company to survey the Qingcheng Mountains, and were injured or killed during work, which was a work-related injury or work-related death, the Binhai Tourism Development Company decided to issue a batch of pensions in order to appease the emotions of the deceased families.

After Gu Yanan returned to the CDC laboratory, he conducted an emergency test, and the results came out quickly.

In the dead bodies, mustard gas residues were detected.

The soil, leaves, and water around the Misty Valley were all contaminated to varying degrees, especially around the cracks in the metal cans in the cave, where high concentrations of mustard gas were detected.

It was determined that the poison was indeed mustard gas, and the next step was to destroy it.

Because there were many metal canisters containing mustard gas in the cave, it was decided to destroy them on the spot in the cave after several expert discussions.

Destroying metal canisters containing mustard gas is not to bury the metal canister, but to use a chemical reaction to turn the mustard gas inside the metal canister into a non-toxic state.

One fine morning, CDC staff arrived in the cave with chemical reagents used to destroy mustard gas.

The staff wearing anti-biochemical protective clothing put the chemical reagents they brought into a large container, and slowly poured the mustard gas in the metal can, and the two reacted, and the deadly poisonous gas turned into a harmless liquid.

It took only three days from determining that the poison in the cave was mustard gas to treating it harmlessly.

Although the fog in the Misty Valley has not been eliminated, it has changed from the yellow that often appears to it to pure white, and the fog here has lost its toxins and is no longer a miasma.

The vigilance of Qingcheng Mountain was lifted, although the Binhai Tourism Development Company folded five employees, the tourism development work continued, while the official expressed sadness, they developed the Misty Valley of Qingcheng Mountain into a scenic spot, not only because of the beautiful scenery around the Misty Valley, but also because of the thrilling things that happened in this cave, the main slogan of the scenic spot has also become a World War II patriotic education base.

After the mustard gas incident, Gu Yanan made a summary report on the whole thing.

More than 80 years ago, during World War II, the Japanese army stored a batch of mustard gas, a biochemical poison, in the Misty Valley cave in Qingcheng Mountain.

For some reason, the poison was not used and destroyed at the time, but has been retained.

More than 80 years later, the metal canister containing mustard gas bursts, and the mustard gas inside volatilizes into the air.

Due to the low-lying topography and climatic conditions of the Misty Valley, the volatilized mustard gas is concentrated in the Misty Valley, and the fog in the valley turns from pure white to yellow.

Whenever someone enters the Misty Valley, breathing in the yellow mist with mustard gas will cause poisoning symptoms, so there is also a legend that there is a miasma in the Misty Valley.

It wasn't until the Binhai Tourism Development Company decided to develop Qingcheng Mountain for tourism and sent the first batch of a survey team of five people into the mountain.

The first batch of five people breathed poisonous gas in the Misty Valley, but the team leader, Captain Li, was more alert and left with the team after smelling the pungent smell, so the group of five people was only slightly poisoned by mustard gas and saved their lives.

The first group of surveyors fell ill and was hospitalized, but the Binhai Tourism Development Company did not pay attention to it and did not investigate the cause, but directly sent the second group of another five-person team into the mountain to continue the survey.

The five members of the second group of survey team, although they also smelled mustard, Captain Zhang, who led the team, did not realize the danger and went directly into the cave and found the metal cans in the cave.

Two of them touched the metal canister and opened the valve of one of the metal cans, and the mustard gas inside quickly erupted, burning the eyes of the two people, Captain Zhang stepped forward to close the metal canister in time, but all five of them inhaled a high concentration of mustard gas.

Two of them were unable to see clearly due to eye injuries and fell into the underground river inside the cave, and were washed out of the Misty Valley with the flow of the river, which was later found by the police outside the Misty Valley.

The remaining three people struggled in the cave, one of them was slightly injured, groping to climb out of the cave, and was rescued by Gu Yanan and his party who entered later, and the other two were seriously injured and lying by the dark river, one of them died, and the other was seriously injured, although he was sent to the hospital, he still died of ineffective treatment.

The first group of surveyors were treated and saved, but left with varying degrees of sequelae.

The second group of surveyors was found dead three times, two were taken to the hospital, one died two days after treatment for serious injuries, and the other died after two months of treatment due to multiple organ failure.

After that, the police conducted a comprehensive inspection of the Misty Valley, and found seven human bones of different ages in the valley and brought them back to the police station.

After police investigation, these people entered the Misty Valley when they entered Qingcheng Mountain to dig bamboo shoots or hunt wild animals, and as a result, they inhaled a poisonous mist with mustard gas and died in the valley.

After the price of blood, the mystery of the Misty Valley of Qingcheng Mountain was also solved.