When Feng Yan saw the circle of young men's friends, Fat Tiger had just solved the second instant main quest.

5 minutes ago.

After receiving the second instant task of the main line, Fat Tiger felt that the system was looking for his fault, and after receiving the prompt message, his favorability towards Feng Yan dropped a lot again, although it was less than 5 minutes after the start of the dungeon at the moment, but he was very unhappy that Feng Yan had not yet rushed to save him.

"What? Do you want me to challenge myself one after another with difficult tasks, in order to cover up the lack of ability of that guy named Yanfeng, so that he will not come to save me for a long time? Is he the Master or am I the Master? ”

The second real-time mission is obviously much more difficult, firstly the water rises faster, and secondly, the whole event is back to square one, i.e., the bottom valve must be opened.

And if you want to open the valve, you have to go back to the problem of finding the key.

"I guess it might not be that simple."

The reason why Fat Tiger has such an idea is because the water is still in the pool all the time, and the Hardmode dungeon is afraid that it will not let this kind of thing that can cause chaos for the player continue to exist and do nothing. As it turned out, Fat Tiger's guess was completely correct.

"OK, don't panic, don't panic."

Fat Tiger forced himself to calm down, ignoring the rising water level, and thought again.

In order to solve the puzzle successfully, the hints given by the system and the environment are very important, so the first thing is to interpret the latest hints of the system.

Obviously, as mentioned in the prompt just now, what is pouring into the pool from the outlet at this moment is no longer water, but an unknown liquid, which may be used as the key to solving the puzzle.

Unable to figure out what this unknown liquid is for the time being, Fat Tiger decided to find the valve first, in his opinion, solving the puzzle of the unknown liquid is the key, of course, the location of the valve must also be clarified.

"At present, it seems that the key and the unknown liquid are the key points, so in other words, the location of the valve should not be too difficult to find, so let's search the center and four corners of the pool first."

Quite smoothly, the Fat Tiger staggered through the water towards the center of the pool, where he kicked the valve, shivering in pain, and lost a little health for it.

By the moment, the water had reached his stomach, and it was almost to his chest.

Taking a deep breath, the fat tiger dived into the water, the water was very muddy, he dived not to see, of course, but to touch the size and outline of the valve with both hands.

After touching it twice, Fat Tiger probably knew the style of this valve.

It was supposed to be a large, rotating valve, probably as large as a washbasin, with a lot of nuts and an iron device fixed under the valve ring, and it seemed that it should be a mouth for a large amount of drainage. There is a very delicate keyhole on the side, Fat Tiger touched it with his hand, this hole is very small, similar to the keyhole of a bicycle chain lock, that is, if there is only one key in the pool, trying to find it is similar to looking for a needle in a haystack.

He tried to turn the valve port hard, but the valve didn't move, and it seemed that it did indeed ask for a key.

After returning to the water, Fat Tiger had no clue for a while, and the valve was found, but no key was equal to nothing.

The water level was rising rapidly, and after just a little time of underwater exploration, the water level had already reached his chest and reached the collarbone position.

Waiting for more anxious, the fat tiger simply began to explore randomly, he used his hands and feet together, one moment to explore with his feet, and the other time he plunged into the water and groped with his hands.

But apparently he didn't understand the point of the puzzle, and it was impossible to find the key by fumbling around.

The water is already up to his neck, and as mentioned earlier, in this case, the water does not need to go over the player's head, as long as it reaches the neck, it will cause the player to start to panic unusually and lose the basic ability to think, and when it reaches the chin, it is basically the end of the game.

Fat Tiger is the same, he began to panic, and if he didn't think of a way, he would really hang up.

"There must be a way, there must be one, wait, what does this smell like?"

Just when Fat Tiger was about to give up, he smelled a smell, his chemistry was very good, and after a little discernment, he knew what it was coming from.

"Hydrogen peroxide!"

Hydrogen peroxide, scientific name hydrogen peroxide, is an oxidizing agent, the concentration depends on the proportion, the general concentration of medical is low, and the industrial use is much stronger.

"Hydrogen peroxide...... Hydrogen peroxide...... In other words, the unknown liquid discharged into the pool is hydrogen peroxide, and judging by this taste, the concentration is quite high, even exceeding the concentration of industrial use, so why is it discharged with such a high concentration of hydrogen peroxide? ”

The answer is definitely not to kill a fat tiger for fun, then there must be other uses.

"There must be a hint, yes, there must be a hint in front that can be linked to hydrogen peroxide to solve the puzzle successfully, what is it? Ahh......h

Thinking about it, the water has come to his mouth, and at this time, maybe it was deliberately caused by the system, the fat tiger's feet slipped, he fell, and suddenly the whole person fell on his back in the pool, and the water instantly wrapped his whole person.

The fat tiger suddenly fluttered wildly, and finally jumped onto the water, jumped and inhaled vigorously, and then sank to the bottom again, at this moment he found that it was useless, and the height of the water had exceeded the height of his body.

There was only time left for him to think, only for his last breath.

And ordinary people can hold their breath for more than 1 minute, which is already very powerful.

All immersed in the water, the fat tiger range was not so flustered, he closed his eyes tightly, and his brain began to recall like a gallop, the content to be recalled is the content linked to hydrogen peroxide.

It was relatively quiet in the water, and Fat Tiger calmed down, and quickly thought of one thing that was mentioned in the system commentary when he first entered the dungeon.

In the commentary that introduces why he is here, and that he and Feng Yan are the master and apprentice of the god stick liar, when mentioning the valve, a modifier is also given in front of it "iron valve".

It was as if a little starlight instantly ignited the inspiration of the fat tiger.

"I understand, hydrogen peroxide has the effect of accelerating the rust and corrosion of iron products, if the concentration is very high, even a few minutes can make the iron rust, and the valve is made of iron, the nuts of those fixtures are also made of iron, if the rust is too fast, the iron filings will fall off, if the fall off is more serious, you can directly pull it open, and find a ball key."

Thinking that nearly half a minute had passed, Fat Tiger felt a little stuffy in his chest, but after connecting the key points, his spirit was lifted.

Thinking of this, he identified the direction a little, swam towards the position of the valve just now, and after coming to the valve mouth, the fat tiger held the valve port of the valve with both hands, and did not turn, and pulled it up directly with buoyancy.

Fat Tiger was overjoyed, knowing that he was guessing the right direction, and then he only needed to uproot the entire valve device, and then he could go and find the key.

As soon as the heart was ruthless, the fat tiger exerted all his strength, and finally completely destroyed the valve when he was about to be choked to death, and the entire valve device was rusted and opened by the fat tiger.

Suddenly, a suction force came from the valve mouth, and the water rushed towards the valve mouth, and the crisis of the fat tiger had not been resolved.

Due to the limited size of the valve port, the suction power is limited, and the speed of draining is limited, although the speed is okay, it still requires the player to endure more than 20 seconds before the water level can be lowered to a position where they can breathe again.

Fat Tiger is gone, and the setting of the system is still a bit human, when Fat Tiger can't stand it and is about to start breathing, he replaces breathing by reducing his health, and finally survived the more than 20 seconds.

Because he is well aware of the dangers of high concentration of hydrogen peroxide, the fat tiger closes his eyes and mouth tightly throughout the whole process, and does not begin to breathe and open his eyes until he is out of the water source.

After all, the water was all discharged from the valve port, and the fat tiger was already sitting at the bottom of the pool, he was breathing heavily, and before he had time to rejoice, the immediate task of the system was updated again.