The heartbeat displayed in the heartbeat monitoring window is Ye Sheng, the ace commissioner of the underwater ace combination of the executive department of the Kassel Academy, and the assistant executive Jiu De Aki, who are wearing special diving suits made by the equipment department and constantly diving in the Qutang Gorge.

In the dark water, two short pillars of light are the only source of light here.

It is a short-arc xenon lamp, which is a point light source with extremely high brightness, with a color temperature of about 6000K, and the light color is close to sunlight, which is the best color rendering light source in the current gas discharge lamp.

But even a xenon lamp, in this deep water of nearly fifty meters, still can't penetrate many distances. Only a band of blue-gray light, filled with plankton, guided the young couple's underwater direction.

Gradually, Ye Sheng and Jiu De Yaji dived to the bottom of the water, and the storm on the surface of the water could not affect the bottom of the water at a depth of tens of meters.

Ye Sheng and Jiu De Aki stood smoothly at the bottom of the water with the help of the steel claws that popped out of their fins, but they did not rush into action.

"Norma, trouble stopping the structural diagram of the water underground."

Ye Sheng called the sonar map on the helmet, and the sound waves were far more effective in the water than the human eye.

"Understood, it will take me about twenty seconds to scan." The Central Processing Unit (CPU) in the United States immediately replied, and their transatlantic conversation was directly using satellite channels.

Soon, a three-dimensional sonar map outlined by dark green contour lines appeared on the screen of Ye Sheng and Aki's helmets.

The entrance to the Bronze City was actually built in the Ming place, but after thousands of years of precipitation, Jiu De Aki guessed that it had been covered with layers of floating soil, and couldn't help but look at Ye Sheng.

Ye Sheng naturally saw this, and he understood what she meant from Jiu De Aki's eyes.

They have been cooperating for five whole years, and they have cultivated enough tacit understanding to be able to understand some simple meanings through each other's eyes.

Although they carried a lot of oxygen this time, in order to prolong the time of their activities underwater, they used to solve some simple communication through their eyes underwater to reduce oxygen consumption.

Ye Sheng looked at Jiu De Aki, nodded, and agreed with her opinion. Jiu De Yaji understood, and the whole person gently stuck to Ye Sheng's back. It's not out of Jiude Aki's love for Ye Sheng, it's just for safety.

There is a lot of gravel at the bottom of the water, and no one can guarantee that there will be small gravel floating between the two of them, and if you hug it casually, it may cause damage to the wetsuit, resulting in a large loss of oxygen. The loss of oxygen not only means a significant reduction in the amount of time they spend underwater in the water, but also means that their lives are at risk.

Jiu De Aki clinged to Ye Sheng's back, and his hands wrapped around his waist from back to front. It's a pity that with such an intimate action, there is no love in the eyes of the two, only solemnity and vigilance.

While embracing Ye Sheng, Jiu De Aki looked around from time to time, always guarding against sudden danger.

Ye Sheng slowly closed his eyes in the embrace of Jiu De Aki, and his golden pupils lit up in the dark.

"Report to the Moniach, I have requested the use of the Spirit Snake, please prepare to activate the electromagnetic shielding of the equipment."

"Moniach received, your life condition is normal, the frequency of brain waves is rising sharply, you can activate the Spirit Snake, and the electromagnetic shield has been opened."

Hearing this, Ye Sheng clenched his fists, and the flashing snake that was swimming in the depths of his mind seemed to have received some kind of signal and swam out of Ye Sheng's limbs in an orderly manner.

Snakes with electric signals swam around Ye Sheng, and gradually, the range of this wandering was constantly expanding. And Ye Sheng's consciousness also followed the movement of these snakes, penetrating into every corner of the snake's swimming range, and even the change of a speck of dust could not escape his consciousness domain.

However, as the range of snakes increased, Ye Sheng's body trembled slightly, his face became more and more dead, his body temperature was gradually decreasing, and his heart rate was constantly decreasing. Jiu De Aki was close to Ye Sheng's delicate body and naturally felt these changes in Ye Sheng's body clearly, although she was used to Ye Sheng's physical changes when using the Spirit Snake, she still couldn't help but tighten her hands around Ye Sheng's waist, hoping that her body temperature could slow down the reduction of Ye Sheng's body temperature, and she also wanted to tell Ye Sheng that she was always by his side.

In such dark, silent water, the danger is not only those crises that will arise at some point, but also loneliness.

Half-breeds have blood mourning, and in such an environment, the loneliness brought by blood mourning will be doubled up.

If Ye Sheng acted underwater alone, with his A-level bloodline, he would definitely go crazy. But Aki will always use his soft and delicate body to tell him that he is not fighting alone.

Love is born from this.

Perhaps because he felt the body temperature coming from Jiu De Aki's body, Ye Sheng's face, body temperature, and heartbeat rate really improved.

Perhaps, he also wanted the girl who was holding him to feel a little more at ease.

Suddenly, Ye Sheng's body trembled violently, and the "snakes" were withdrawn because they hit the wall, but more "snakes" penetrated a wall.

Is that...... A metal wall?

No, it's a huge, metal-made city!

Only a wall made of metal will produce such good electrical conductivity as a "snake"!

"Report, a metal city has been discovered, and I request to be explored."

Ye Sheng's words caused the members of the executive department in the forward cabin of the Moniach to break the silence inside, and they all cheered and high-fived.

It was a good start, and after only twenty minutes of diving, the suspected Bronze City was discovered, but Mance Rundstedt quieted everyone with a silent gesture.

Until it is certain that it is the Bronze City made by the Lord of Bronze and Fire, any discovery can only be called a suspected discovery.

Mance Rundstedt picked up the walkie-talkie, hesitated for a few seconds, and said, "Request approval." Be careful, and you can return when you encounter danger. ”

Ye Sheng didn't answer, just patted his hands on his waist, and a smile appeared on his face in the diving mask.

It is both rejoicing for their good start and delighting for the girl's heart.

Ye Sheng took the hand of Jiu De Yaji and motioned for her to follow him.

Through the connection between the consciousness in his mind and the "snake", Ye Sheng smoothly took Jiu De Aki to the metal wall he found.

The turquoise metal came into view under the illumination of the xenon lamp, and a flash of excitement flashed in Ye Sheng's eyes!

"Report, discover the Bronze City."

Ye Sheng's voice trembled slightly, after all, it was Bronze City!

The dormitory of the Lord of Bronze and Fire!

The discovery of the Bronze City means that even if he and Jiu De Aki will quit the Enforcement Department after this mission, the names of the two of them will inevitably appear in the annals of the half-bloods.

The Moniach erupted in cheers again, and even Mance Rundstedt's frown soothed.

It seems that he is thinking too much.

Today, there will never be an incident like the Greenland Ice Sea!

On the contrary, today will be the most monumental day in human history right now!

It's just that...... No one realized that a blue-gray figure was on the top of the Bronze City, quietly looking at these two uninvited guests.

Ye Sheng just stared straight at the bronze gate and forcibly suppressed the excitement in his heart.

Although he is happy that he and Aki can go down in history, he is not a person who is greedy for merit.

In other words, because he is about to start a new life with Aki Saka, he will not be even more adventurous.

"Report, do you want to enter the Bronze City immediately?"

Ye Sheng glanced at Jiu De Aki behind him and quietly held her hand.

After a period of excitement, fear gradually lingered in his heart.

As the dormitory of the dragon king, how could it not have the means to defend against foreign invaders?

Although Mance Rundstedt was also happy to discover the Bronze City, he remained calm after the joy, and he hesitated for a moment, but still did not resist the temptation.

"Approved, be sure to pay attention to safety, once there is danger, we will immediately recycle the safety rope!"

After Mance Rundstedt said this, his heart suddenly felt a little uneasy.

The fury of the shouting outside was like the laughter of the devil, the mockery of the prey after entering the trap.

And at the bottom of the water at a depth of one hundred and fifty meters, Ye Sheng and Jiu De Aki couldn't hear any wind, and after obtaining permission, they cautiously walked to the bronze gate.

This bronze gate has been corroded by the water element for thousands of years, and it should have been rusty, and even collapsed at the touch of a button, but the strange thing is that there are no rust spots on it, just like a brand new bronze gate, standing in front of the eyes of the two.

Ye Sheng looked at the pattern carved with "face burning in the fire" on the door, it was a raised human face, with burning firewood in his mouth, his face was twisted and painful, but he refused to let go of his teeth clenching the firewood.

This is the same structure as the bronze city in Northern Europe recorded in the Ice Sea Fragment.

The face on the door is not really an ordinary sculpture, but a living being.

It was a great achievement in alchemy, containing the spirit with the purest substance, and then acting as a gatekeeper. It is very difficult to destroy a gate with a living soul, at least with the current human technology, it is impossible to destroy such a gate without harming Ye Sheng and Jiu De Yaji and the entire Bronze City underwater.

Seeing the living spirit on the door, Ye Sheng, who was proficient in "Magic Mechanical Design" and "Alchemy Chemistry", naturally knew what they needed to open the door.

"Report, found living spirit on the door, request for the blood of the 'key'."

The so-called "key" is actually a small baby.

For unknown reasons, this little baby is unable to grow like a normal human baby.

But in this small body, there is a huge amount of power.

It's a blood-derived mark, an ability that comes entirely through heredity.

Those with this ability are able to communicate alchemical items with their own blood, and gain control of them in defiance of the permissions set forth by their makers. Even if it was an alchemy weapon that could only be controlled by a dragon king-level object, anyone with this ability could easily hold it.

However, this ability is more used to open doors, because almost all high-level dragon graveyards and hatcheries are alchemical guards, which means that there are alchemy gates in some sense, and these alchemy gates are difficult to destroy without destroying the dragon tomb and hatchery, but these extremely difficult to crack access gates are ineffective against the holder of this bloodborne engraving ability.

No one knew how it worked, not even Nicholas Flammel, a master alchemist, could not explain why, but exclaimed: "Every door it opens leads to hell." It was not named Bloodborne Seal Solomon's Little Key.

The little baby with this ability is named "Key" by the Executive Department.

Whenever the Enforcement Department carries out this kind of exploration mission that is suspected to be the dormitory of the first and second species, it will carry the blood of the "key" or "key". Although the "key" will chant like a spirit when it opens the door, it is his blood that is really used to communicate with the alchemy items.

Therefore, due to the potential danger of this operation, and the fact that the Executive Department only has one "key", although Schneider allowed Mance Rundstedt to take the "key", he did not allow the "key" to enter the water, and only allowed him to voluntarily extract a certain amount of "key" blood to open the door without affecting the life of the "key".

With the "key" by his side, Mance Rundstedt naturally did not worry about the lack of blood of the "key", and directly approved Ye Sheng's request.

After Ye Sheng received an affirmative answer, he took out a metal box from the pocket of his wetsuit. The lock was opened, and three test tubes with the blood of the "key" were lying quietly. According to the original plan, entering the Bronze City would inevitably consume one, and coming out would also require one, and the last one would be a backup.

Ye Sheng carefully took out a test tube, although at such an underwater, even if the test tube fell off the water, it would not cause the test tube to break, but Ye Sheng's movements were still very gentle, for fear of wasting the blood of this precious "key".

After taking out the test tube, Ye Sheng handed the metal box containing the other two test tubes to Jiu De Yaji, who understood and helped Ye Sheng put it back in its original position. After making sure the metal box was ready, he approached the bronze gate.

The cork on the test tube was slowly opened, and Ye Sheng aimed the mouth of the test tube at the mouth of the figure on the bronze door, and slowly "dripped" the blood inside into its mouth.

The moment the blood entered, the bronze face suddenly opened the fangs in its mouth, and teeth as sharp as daggers popped out of its "sockets".

If it weren't for Ye Sheng's contact with the living spirit, I am afraid that he would immediately retreat to a safe distance from the bronze gate. But even though he had seen it several times, he and Aki couldn't help but feel a creepy feeling when they watched the living spirit devour the blood.

The blood in the test tube spread along the river, but the bronze statue's mouth seemed to have a kind of suction, and the spread of this blood never exceeded a certain range, and finally it was sucked into the mouth of the bronze statue.

The bronze figure, which had sucked up the blood, was silent for a moment, and slowly opened its mouth, as if it had been eaten and burped.

The reason why it was said to be hiccups was because the "snake" that Ye Sheng did not take back sent a sound for him.

There was a sound of metal heating and shattering from the depths of the bronze wall, and after a while, a pitch-black hole about a meter in diameter appeared on the bronze wall, and the bronze wall was full of dagger-like teeth in the mouth of the bronze statue.

The eyes of the bronze statue suddenly turned, and Ye Sheng was so startled that Ye Sheng pulled the wine De Yaji and hurriedly retreated, thinking that it was a living spirit running away.

But the imaginary accident did not happen, and the eyes of the bronze figure only stared at the dark hole, and an inexplicable majesty emanated from it.

In an instant, as if a mouse had seen a cat, the sharp tooth of the handle was withdrawn into the bronze wall.