This tracker is very powerful. It transfers signals through satellites. The radio frequency of the signal is complex and can cover two kilometers.

But this was on land, and the Inuit later jumped into the lake. After he went into the water, the signal on the tablet suddenly became worse.

Li Du asked quickly: "Can the tracker be waterproof?"

Little Macklov made an OK gesture and said, "The signal will be worse in the water, but don't worry, it has waterproof function."

Indeed, although the signal reflected on the computer has weakened a little, it is still clearly visible.

They could not go into the water in a swarm, because the boy had jumped into the water before and disappeared. Li Du was always a little afraid of this lake.

Little Macklov came up with an idea that they could track the lake on a kayak. Anyway, the deepest part of the lake is only 500 meters, and it is still within the signal reception range of the tracker.

"Besides, I don't believe this guy can dive 500 meters. Please, he doesn't have tools to assist, nor does he protect his body. How could he dive 500 meters, right?" said Little Macklov.

Li Du said: "Be careful, let's follow him."

The signal flashed on the screen for a while, and finally, the red dot disappeared.

At this time, the raft was located in the middle of the lake. The Mistula Island was not far away from them. The underwater at this location was still part of the Mistula Island base, but it was at the end of the Mistula Island base, with a water depth of hundreds of meters.

The group on the boat was stunned, and Big Macklof asked, "What is your record of unassisted freediving?"

Brother Wolf said: "I'm about forty meters, and the black bull is a master in this field, about fifty meters."

"It's at least one hundred meters deep here!" Little Macklof said, gasping for a cold air.

Li Du said: "Don't discuss this for now, the signal disappears. What's going on?"

"Either the signal is isolated or the tracker is destroyed, anyway, it's just that it can't receive the signal it sends."

Li Du said: "Then write down this location and prepare the submersible. Let's go and take a look."

"Go down right?" asked Brother Wolf.

Li Du shook his head: "No, put down the camera in the water first. Mr. Elson sent a marine exploration robot, right? Let's go down and let's see what the situation is."

He didn't want to take the risk directly. The water depth of 100 meters is too terrifying. Who knows what is underwater?

After all, he is about to be a father, so he can't have any problems. He must go back to see Sophie well, and then wait for the child to be born to see the child.

Soon, the Ocean Exploration Robot was put into the water.

The robot is spherical, with multiple wheels and brackets on all sides, which can adapt to the complex terrain of the seabed.

It is connected by a cable that provides electricity to it and is also responsible for passing back the images captured by the camera.

The robot slowly fell into the water, and there were some cameras next to it. These cameras were fixed by it with surrounding brackets. Whenever it reached a certain water depth or a predetermined position, the robot could be controlled to release the bracket and release the camera through the computer.

Finally, the robot fell to the bottom of the water, and then the strong light shone out, and the scene at the bottom of the lake appeared.

When they reached a 100-meter-deep water, the sun was powerless. It was dark here. If the robots did not turn on the lights, they would not see anything.

The lights are open, and a blurred view of the lake bottom appears on the screen.

Just as Li Du already knew, the bottom of the lake was covered with silt and stone layers.

Generally speaking, lakes are stagnant areas compared to the ocean. The fish, shrimp, algae and other organisms living in the lake will rot if they die. Then over time they deposit at the bottom of the lake, forming mud.

But this is not the case with Lake Anjikuni. The sediments at the bottom of the lake seemed to be stirred up by something, causing the lake water to be turbid, and the bottom of the lake that was supposed to be mud exposed the crust layer below.

The robot's field of vision is limited, and Li Du operates it to move forward, and then after traveling for a distance, it is blocked by a stone.

There are some snails and shellfish growing on the stone, with several shellfish being white assembled and colorful patterns on it.

Li Du hurriedly took out the two shells he got from the boy and Bit. As expected, they were exactly the same!

"They should be from here..." Before he finished speaking, the screen suddenly became darker and no signal was sent back.

This shocked Li Du and quickly operated the robot to return.

At first he thought something was blocking the camera, but after a second operation, he didn't respond. He immediately understood that it was not something blocking the camera, but something had taken the robot away.

Brother Wolf retracted the cable connecting the robot. Sure enough, the cable broke and they lost the robot.

Looking at the cable break, Brother Wolf said, "It was cut with a sharp knife, and the cut is very flat."

Little Macklof scolded: "Fak, who is messing with the water? Change your diving suit, I'll go down to see what's going on!"

Li Du stopped him, but he was not excited or angry, but laughed relaxedly and said, "Don't worry, I think we are getting closer and closer to the truth. They have scrapped the robot, but we still have cameras."

After another operation, several cameras in the water were activated remotely.

This type of camera comes with a battery, where the power supplies video and lighting respectively. Because the battery does not store much power, Li Du generally does not use the lighting function.

But now it is obviously not the time to save electricity, so he activated all the cameras controlled in the water.

It was like a pair of sharp swords inserted into the darkness, and the darkness of the lake became brighter.

One of the cameras happened to be shot down, and the scenes it captured were sent back to the computer screen, which surprised Li Du and his group:

I saw that under the light, the vast lake bottom was not flat. There were circles of protrusions on it, which were protruding from the earth's crust, but because it was shaped like a spiral, it seemed like a vortex appeared at the bottom of the lake.

The stone that blocked the little robot's route just now came from the protrusion, but because the protruding crust was too long and wide, it would not be visible unless you look down on it.

Looking at the circles of spiral bulges, Brother Wolf was surprised and said, "What is this? Is the spiral breakwater?"

Firecracker pointed to a corner of the screen and said, "Switch quickly, switch to this camera, someone..."

Hearing his words, Li Du quickly switched the camera's field of view, but it was too late. After switching over again, the screen was blank, and only after a while, a few white fish waving their tails passed by.

In addition, the small screens on the large screen become dark one after another, which is the reason why the camera is damaged.
Chapter completed!