There is a room behind the metal door, and at the end of the room there is a downward passage. This room was supposed to be a place for the guards to rest, and something resembling a bench of chairs could be seen on either side of the room.

The three of them walked down the passage, which was pitch black and there was not a glimmer of light. All three of them opened the battle view, with Yinyue at the front, Shangguan Yuyan and Li Na behind her.

The passage was so deep that they walked for twenty minutes and didn't come to the end. The footage transmitted by the Scout Eye was not abnormal, and only the pitch-black passage could be seen.

After another twenty minutes, they finally came to the end. At this time, the Scout Eye is suspended in mid-air, conducting a perspective scan of the gate at the exit.

To their surprise, there was a large space behind the door, filled with liquid.

According to the analysis of the scan data, those liquids should be ordinary water. Could it be that the underground palace was flooded? Or is the underground palace connected to the underground river?

Shangguan Yuyan and the three looked at each other, and they were a little hesitant, whether to enter or not. I've done so many missions before and I've never touched water.

For Shangguan Yuyan and Li Na, a palace full of water made them feel a little hairy in their hearts.

For them who have evolved perfectly, it is not a fear, but an instinctive reaction. After all, they are the perfect evolutionaries of the day after tomorrow, and unlike the Silver Moon Wang Ying, they still retain a little bit of ordinary human thinking.

"Let me go in first!"

Yinyue was very smart, and she could see the thoughts of the two of them at once.

"No! That palace is likely to be connected to an underground river, and it would be dangerous to go straight in! Shangguan Yuyan hurriedly stopped.

Just now, Shangguan Yuyan did a detailed fluoroscopy scan and found that the water behind the metal door was not stagnant.

The water is moving in one direction, and it's quite fast. The pressure inside is very high, and it is not easy to open the metal door.

Even if the metal door is opened, the passage will be flooded. The water behind the gate is so fast that if you enter, you will be replaced by the current into the underground river.

The underground river extends in all directions, and it is not easy to get out of it. Even if there is Warframe protection, it is temporary. Once the Warframe runs out of energy, there is only one ending.

What's more, the underground Hanoi does not know what danger there is, and if you engage it, you will quickly run out of energy in the water.

"We're here, we have to go down and have a look!" Yinyue said.

"You must see it, but you can't rush in. The water behind the door is very fast, and we will be replaced by the current into the underground river, and then we will be very dangerous! Shangguan Yuyan said.

"Why don't we contact Tis and ask her to send a team of robots in there." Li Na said.

"This way it works!" Shangguan Yuyan nodded.

Hearing Li Na's words, Yinyue did not object, so they contacted Ties. And Tice didn't send a robot, she sent an underground exploration machine.

Exploration aircraft are designed specifically for subsurface exploration and are far more powerful than robots. And the exploration machine is also equipped with special instruments that can penetrate heavy rocks underwater.

When the prospector arrived, the three of them retreated to the main hall. In order not to trigger the mechanism of the underground palace, they still cracked the code of the last door first.

After the password was activated, another door fell at the gate, just inside the exploration mechanism. The moment the gate fell, the last door began to slowly lift.

Burst...

A strong stream of water rushed through the crack in the door, rustling the floor. Soon, the water pressure in the room was the same as outside the door, and the last door was opened.

The prospector slowly drove out of the room, and as soon as it emerged, it was carried in by the strong current. The prospector floated in a circle and went deep, but fortunately there was enough space here, otherwise it would have crashed into the surrounding walls.

Under the control of the intelligent system, the power system of the exploration aircraft was immediately activated, which stabilized the body. At this time, the exploration plane had already floated more than a dozen kilometers along the current.

Through perspective scanning, the three Shangguan Swifts saw the location of the exploration plane, which shocked them very much.

The speed of this water is too fast, and it only takes a few moments to float out for more than ten kilometers. Fortunately, let the explorer in first, otherwise the three of them would have been separated by the current.

As soon as the propulsion system was activated, the prospector began to scan the surroundings. As Shangguan Yuyan said, the underground palace and the underground river are connected.

The space of the underground palace is large, and the narrowest point is also a kilometer in diameter. The prospector headed towards the wall on one side, then searched deeper along the wall.

The exploration plane searched another ten kilometers and found that the energy particles in the waters in front of it were getting denser and denser. When the explorator enters that water, the energy begins to deplete dramatically.

In less than five minutes, the energy system sounded the alarm. The intelligent system reacted immediately, allowing the exploration aircraft to exit the water.

At the same time as the exploration plane entered that water, Shangguan Swift also lost contact with the exploration plane. Just as they were in a hurry, the exploration plane retreated.

"What just happened?" Li Na asked.

"The prospector has sent a message, and it has found a body of water in front of it, containing super-energy particles!" Shangguan Yuyan said.

"What!" Li Na exclaimed.

"How can there be super-energy particles in the water!" Yinyue was also puzzled.

Shangguan Swift immediately gave the exploration plane an order to scan the water. It was found that the super-energy particles in the depths of the underground river were more intense.

Moreover, this particle can absorb energy, and their armor can only last for a maximum of ten minutes when entering, and the energy of the armor will be consumed.

"Oh my God! There is also this kind of place, but fortunately I didn't let Yinyue in! Li Na swallowed.

This super-energy particle will absorb energy, and the exploration machine will not last long if it enters it. Not inaccessible, how to scout the situation inside.

Now if you want to continue scouting, you have to isolate those super-energy particles. In desperation, Shangguan Yuyan could only withdraw the exploration plane and prepare to let Tis transform it.

A few beauties didn't expect that things were getting more and more complicated. Fortunately, a small manufacturing workshop was set up on the Mineral Satellite, which was used to renovate the exploration aircraft.

According to the data scanned by the exploration plane, Tis has built a magnetic controller for the super-energy particles.

The controller is installed in the power system of the exploration aircraft, which can release a powerful magnetic field to protect the power system from the invasion of super energy particles, and can also convert super energy particles into energy.

With this device, there is no need to worry about running out of energy from the exploration machine. If it was Shangguan Swift's battle armor, there was really no way to pass through that super particle belt.