Six minutes is Ye Jian's limit, but for many people, six minutes of underwater oxygen has already lost his life.

The big shark let out a long sigh again in her heart, and then gathered her mind for the second test, no matter how powerful she is, she will not belong to the navy, and she will not belong to the storm commando.

However, it is exciting for a female soldier to surpass a male soldier, regardless of whether she belongs to her own unit or not.

Ye Jian didn't know the churning in Da Shark's heart, and when she came out of the testing room, she quickly adjusted her body to enter the high C02 tolerance adaptation test.

This is the training that frogmen must learn, and it is also a compulsory test for the selection of members of the Storm Commando.

"Here's a table for our C02 tolerance training, you can take a rough look." The big shark, who accompanied and recorded the whole process, had a slight voice, standing in the clear sea water and said to Ye Jian, who had already prepared for work: "The body breathing time decreases by 15 seconds, while the breath-holding time remains the same. We have a thirty-minute test, and you may be a little uncomfortable, and there may even be a physical reaction of nausea and vomiting. ”

"There's a coral archipelago down there, and you need to dive to the bottom of it, which is about 15 meters above the surface. Remember Ye Jian, we need to record your best personal results, as well as your worst results. In thirty minutes, I'm going to find out if your grade point average is passing. ”

High CO2 is a dangerous test that does not carry any air source and only dives underwater with a closed breath, when Ye Jian closed her breath and dived to the bottom of the sea, she closed her eyes and kept swimming like a fish to swim to the bottom of the coral.

The oxygen level in the blood began to drop, and the high concentration of carbon dioxide gradually made the body feel uncomfortable, and the diaphragm muscles that began to twitch told Ye Jian that she needed to breathe and needed to rise to the surface of the water to get oxygen.

Relax, relax, the body must be relaxed, let your body and spirit not become afraid of the gradually increasing CO2 content in the body, listen to the sound of water, feel the joy of fish swimming by, avoid disturbing yourself because of fear and other factors, until the blood oxygen content is low to the limit, Ye Jian quickly rose to the water.

"The rest time should not be too long, otherwise the C02 that has been accumulated with great difficulty will be excreted from the body because the rest time is long enough, and the purpose of accumulating high C02 will not be achieved. Once it surfaces for more than 30 seconds, the cumulative effect of C02 is very bad. Ye Jian, you have to control the ventilation within 20 seconds and dive back into the sea. ”

The big shark's very strict voice kept reminding Ye Jian, and when he waited for Ye Jian to ventilate again and dive into the sea, the expression on his face would be solemn.

20 seconds of ventilation is actually harsh for a recruit, but he really wants to know if Ye Jian can surpass the recruit again, and take the 20 seconds ventilation that is a bit too dangerous for a recruit.

For recruits, it is a bit dangerous to change air in 20 seconds, but for Storm Commandos, it takes a long time to change after 20 seconds.

In the process of full breathing, each breath will exchange the gas in the lung capacity, and the frogman will immediately enter the next round of high C02 after resting for 15 seconds, and giving Ye Jian an extra 5 seconds is the time for the big shark to finally think it is feasible and conservative after several rounds of testing.

Dive into the bottom of the sea 15 meters in one breath, Ye Jian, who held his breath for 2 minutes, rushed up again to rest for 15 seconds, and so on for 30 minutes, and after the whole test was over, Ye Jian, who was hard-working and hard-working, felt that all his strength seemed to be drained.

Da Shark looked at the female soldier who was wet all over her body, even if she was tired, she maintained the arrogance of the soldier, and then looked at the record on the form, the Adam's apple was very light and slid up and down a few times, ...... such a record was enough to make their comrades in the team drop their jaws in shock.