(The promised fifth update, the last update will be posted in the early morning)

In other words, when the divers descend to 10 meters, the pressure doubles. This sudden change will make many divers feel uncomfortable.

At the same time, this depth is also the most dangerous depth. If you refuse to complete statistics, most diving accidents occur in the area of ​​0 to 10 meters.

And once it drops to 10 meters away, the light and scene will change greatly, and there is a greater probability that the depth of deep sea phobia will occur.

Fearful mentality can cause panic and anxiety to divers, leading to symptoms such as shortness of breath and rapid heartbeat. In severe cases, people may also experience dizziness, suffocation and other dangers.

It can be said that diving is a very dangerous behavior. Those who fish oysters, abalone, and sea cucumbers in the sea can be said to be making money by their lives.

Every time he goes to sea, he is a gambling, so he can't play tricks. Lu Hai has been using high-definition underwater cameras to monitor the every move of the No. 6 Primitive Man.

The performance of the No. 6 diver was relatively stable and confused. However, the sudden movements made Lu Hai nervous.

He crawled down at the bottom of the sea.

It looked like it was a state that appeared after a sudden onset of illness, and Lu Hai immediately pulled the diver up.

After pulling it up.

When he found out that the diver was not seriously injured, he made that move, just praying to the "great existence". After learning the news, Lu Hai was very helpless.

Just tell Xiaobai and tell him not to hide in place and walk on the bottom of the sea.

Lu Hai retested it again. This time the main test was what the primitive people would react when facing sharks and some large marine creatures.

There are relatively small blacktip reef sharks in this area. This shark is relatively small, with a maximum of only about one meter. Most of them live in reef areas, and generally use sea fish as the main food.

Lu Hai encountered many such sharks when he was snorkeling in Maudyve. They were quite gentle. Yuxue was holding it and took a picture with it.

Almost five minutes later.

Diver No. 6 came into contact with the blacktip reef shark. Because the sharks are generally curious, four or five blacktip reef sharks swam towards No. 6.

Perhaps out of instinct, when the No. 6 Primitive Man saw the shark swimming towards him, he picked up the harpoon in his hand and wanted to attack. This was just given to him by Lu Hai.

After having the weapon.

He was indeed more calm under the water, but when he was facing the sudden arrival of the shark, he was still at a loss and instinctively wanted to attack.

Fortunately, the blacktip reef shark had not yet approached, and it quickly fled because of the effects of the shark repellent bracelet and shark repellent.

Overall.

It was still very successful. This time, the primitive man stayed in a 10-meter-deep water for a full 20 minutes.

However, compared with the old fishermen, it only takes one or two hours to go down, it is still far behind.

Next.

Lu Hai simply tested 20 meters. Divers at this depth had to bear the pressure of three atmospheres. At this depth, divers would have to bear greater psychological pressure.

Because 20 meters is almost six floors high, and at this depth, there is also a very headache problem, that is, when floating, you must not hold your breath.

Otherwise, the lung explosion may occur. In 2018, a diving enthusiast in Palau also held his breath and increased when he was about 20 meters deep, causing the lung explosion to die.

In addition to this, there are also very terrifying decompression symptoms. This symptoms usually occur within 2 to 48 hours after they surface, and joint pain, limb numbness, and large erythema of the skin.

Also, flights are not allowed within 12 hours after diving. If the diving time is longer, flights are not allowed within 18 hours.

Because diving inhales a large amount of nitrogen, nitrogen is one of the factors that cause decompression.

In addition, there is usually no standard atmospheric pressure added in the aircraft cabin, but about 0.6 atmospheric pressure. When the body passes through two air pressures with a relatively large gap within a day, there is a high probability of decompression.

Of course, Lu Hai does not need to consider the issue of primitive people flying, but you still have to pay a little attention to the symptom reaction of diver No. 6. Once joint pain occurs, oxygen inhalation treatment will be immediately required.

When performing this depth of 20 meters.

Lu Hai had considered giving up, but after thinking for a while, he finally decided to take this step. No capitalist would stop his steps because of kindness.

Takeaway companies never force delivery workers to run red lights or motor vehicle lanes because of pressing delivery times.

Pharmaceutical companies will not reduce medical costs because of pitiful patients.

Lu Hai felt that as he had more and more wealth, his ideas had also changed quietly. It felt like a natural thing, without the need for others to teach, and his instinct would change.

Before diving.

Lu Hai asked the diver to wear a set of thermal underwear, which is very cold even in summer at a depth of 20 meters. If you work for a long time, you will have a high probability of cramps.

Once ready.

Lu Hai drove the fishing boat to the designated location and conducted the first 20-meter dive test.

Lu Hai is not a one-time thing, allowing the diver to dive to a depth of 20 meters, but slowly put him down, and at the same time, using an underwater high-definition camera to monitor the diver's every move.

10 meters, normal.

15 meters, normal.

20 meters, normal.

Data transmitted from the instruments on the underwater cameras is that at a depth of 20 meters, the pressure has three standard atmospheric pressures and the temperature has dropped by more than ten degrees.

Diver No. 6 actually started walking on the seabed 20 meters deep. For Lu Hai, this should be the best thing today.

The first primitive man who was drawn showed such a strong diving talent. So far, he has not shown any adverse reactions, and even a common disease such as a headache has not appeared.

This made Lu Hai full of confidence in the next test. Maybe these primitive people can really beat modern people when diving.

Lu Hai even felt that even if they didn’t have these submersible equipment, they might be able to take a walk under the sea easily after they learned to swim.

Lu Hai looked at the countdown to the mission.

【Countdown to Mission: 4 days, 12:10:39】

Time is very tight.

It is still very difficult to find white jade sea cucumbers in this vast sea. Lu Hai also thought about it and pulled the underwater high-definition camera to search for it.

As a result, it was found that this was simply impossible. If the boat started, the underwater camera would be shaking, and it would be difficult to see clearly what was under the sea.

Not to mention finding white jade sea cucumbers that are only about ten centimeters long, the safest way is to use the primitive people to conduct a carpet-style search of the areas where sea cucumbers grow.
Chapter completed!