Yu Xiaohu was shocked after it was indeed a mecha, and at the same time, it belonged to a bio-breeding mecha that could not be made by earth technology.

But now the colonized mech that blocked the tunnel with its body in the depths of the crater was left with an empty shell, and there were signs of violent dismantling on its inside.

And looking at the traces of its dismantling are at least 70 years old, so who dismantled the contents of it?

Shocked, Yu Xiaohu immediately ordered the engineering robot to move the mecha that was only an empty shell.

When the empty shell of the mech is removed, the cavern inside will appear smoother.

The Scout Robot walked down the slide to the end, where there was a door that had been corroded by parasites.

It's just that this door is not metal, it is composed of a high-level conspiracy structure mixed with biological and special metals, and it appears to be very strong.

When the robot removed the parasites from the door, it revealed a smooth, flat door that had been blasted, but only a hint of dents.

At the same time, near the gate, there was a larger crater, and there was some slight residual nuclear radiation around it, and there was a mountain of scrap metal inside.

Yu Xiaohu did not rush to let the robot crack and open the door, but reconnoitred and scanned the surrounding environment.

Some of the areas extending from that door have traces left by the heavyweight explosion, and according to the analysis of the residual nuclear radiation, it has been at least 70 years or so, and the residual nuclear radiation has not completely dissipated.

By chance, the robot found fragments of a warhead at an explosion point.

The fragment didn't have any exploration price for the robot scanning judgment, but when Yu Xiaohu accidentally saw a mark on the warhead fragment, he was immediately attracted.

At his command, the robot picked up the fragment. After Yu Xiaohu asked the robot to erase some of the parasitic residues on it, the mark on it was displayed, although it was already very faint, but Yu Xiaohu recognized him as soon as he saw the mark.

Because the fragment of the warhead was marked with a swastika marking, it was easy for him to think of World War II and the Nazi symbol.

But Yu Xiaohu was a little puzzled. How can there be such a swastika mark here, and there is still a fragment of a warhead, according to the Internet or some local information queries, the Nazis during World War II seem to have basically no ability to make nuclear bombs, if there is, the Nazis may have conquered the world a long time ago, so why there will be warhead fragments with swastika on the bottom of the sea, and there has been a nuclear explosion.

Yu Xiaohu connected to the Internet and checked it carefully, but there was still no information related to it.

It's just that. As Yu Xiaohu prepares to give up these inquiries, he suddenly discovers clues about a submarine built during World War II and cruising around it on a secret mission.

This submarine is the same one that Yu Xiaohu found on the way last time he cruised on the Ichthyosaurus, carrying several tons of gold and antique jewelry, but accidentally sank in the Pacific Ocean.

Then, the Mitsui family was destroyed by a mysterious force, and the transport submarine was nowhere to be found, and it was not until Yu Xiaohu excavated him that he learned about the origin of the submarine from the records of its black box.

It's just that what exactly happened before that submarine was transformed, what this submarine ran to the Far East, is a mystery. No one knows about it to this day, and there is no record of it in the extant literature.

But. Now, when Yu Xiaohu discovered here, this undersea ruin is related to what alien technology has left, and the stump of a warhead with a swastika has been found here, and there is also the skeleton of a giant American orangutan that has undergone genetic mutation near the giant crater, what is the connection between the two?

These mysteries seem to involve a big secret, but Yu Xiaohu has only discovered the tip of the iceberg that has been exposed, but he has no clue.

Shook his head. Putting these thoughts aside, Yu Xiaohu's attention was on the door again.

I saw that the robot had completed the detection of the door, and the door was completely locked after the energy was exhausted, but the robot drilled a small hole in the door and found after testing its internal structure. The way it operates is essentially the same as the energy supply chain on the base island.

It's much easier that way.

Because there are a large number of biological instrument structures integrated inside this door, Yu Xiaohu asked the robot to simply inject a little energy into the integrated structure on the door, and an indicator light on the biological instrument panel on the door suddenly flashed a few times.

As the indicator light on the panel flashed, the robot quickly poked into a probe and entered a small hole exposed in the panel, only to see that the data structure in the door was quickly scanned and copied, and its structural features and structural parameters were also quickly calculated.

After the data was transmitted back to the Ichthyosaurus, Yu Xiaohu had the intelligent system on the Ichthyosaurus analyze the cryptographic features of its biological mechanisms.

The analysis of the results is very simple, the biological code on the door still follows the original algorithm stored in the base island technology tree information base, after Yu Xiaohu contacted the base island, he quickly found the highest authority command password of the strategic platform module in the original algorithm of the information base, which is also equivalent to the super password that can control the entire strategic platform module.

After sending the super password to the robot, the robot will input a certain amount of energy into the instrument panel inside the door again, and after the panel is in a temporary working state, it will quickly enter the super password.

Click!

When the code was entered, there was a sudden soft sound from the inside of the panel, and the door suddenly shook slightly.

With a slight shock, the door that had been unable to break a nuclear bomb seventy years ago slowly opened automatically.

But when the door opened, there was a passage inside, which was blocked by some debris, and it was still full of seawater.

After the robot team entered the channel, Yu Xiaohu saw through the monitoring screen that the area of the channel was relatively large, and the structural characteristics of its ground were different from some modules on the base island, and there seemed to be two large teleportations.

The portal is powered by energy, but now that the entire module is depleted, it will naturally lose its usefulness.

Walking along the passage to the end, I saw two stairs on the left and right, and after the robot went down from the two stairs, it went to two different directions. (To be continued......)