Wang Dali stood on the ice covered coast, watching the giant icebergs floating in the bay. The cold wind blew, and he couldn't help shivering.

A group of minke whales swim in the Bay and occasionally cross the sea. They are very active.

"Audience, please keep your eyes open. Now I will officially lead you to explore the mechanical civilization fortress at the bottom of the sea!" Wang Dali jumped into the sea.

Optimus Prime flew into the air and plunged into the cold water.

They kept diving in the clear and cold ocean.

Optimus Prime's size and weight allow him to sink directly to the bottom of the sea without any action.

Several whales swam by Wang Dali. The super camera immediately gave a wonderful shot to the nearby marine creatures. Soon, two groups of fish swarmed from a distance.

There are tens of thousands of fish in each wave. They are all small fish with a palm size. They look very spectacular.

"Cool, rare sight -"

"The north and south poles are still a paradise for marine animals -"

"Such close observation is rare. I have gained a lot of experience -"

"Look, there's something at the bottom of the sea -"

"Wow, Dafa, is that an undersea city?"

"God, what have we found? A miraculous steel city -"

"It's an alien fortress city. It feels like a huge six snowflakes -"

People were shocked and saw a huge steel city fortress on the seabed gravel of the northern shelf.

It is a huge city with regular shape, like six snowflakes, with a diameter of several kilometers. It is divided into several districts. There are many steel roads and brand-new steel buildings, which looks very shocking.

The most incredible thing is that a huge semicircular transparent energy cover covers the whole city fortress and resists all the sea water.

The energy shield is like a small sky to prevent the fortress from being flooded.

"It's it. This is the fortress we rode to the earth. It's still working!" Optimus Prime was overjoyed.

"What is that transparent energy shield? How can it keep the sea water out?" Wang Dali was surprised. It was incredible. He felt that the city fortress was very tall and had a high-tech visual sense.

"It's an energy field, which is one of the most important defenses of the fortress. It can resist not only bombardment, but also sea water!" Optimus Prime said.

"It's cool. Are your fortresses of mechanical civilization so huge?" Wang Dali sighed and had to admit that how much metal does such a fortress cost?

It's not ordinary steel, but special alloys, maybe titanium alloys, maybe black technology alloys, or even life alloys with memory on mechanical life bodies.

If so, the value of this fortress will be incalculable.

"This is just a city level fortress. In our mechanical galaxy, there are bigger fortresses, such as land level fortress and Planetary Fortress. Especially the latter is the real big Mac and the strongest force on which our mechanical civilization depends!"

"What is a Planetary Fortress?"

"It's a giant fortress around the planet. It's usually as big as an earth satellite or a Jupiter satellite!"

"You mean a huge steel fortress like the moon?" Wang Dali was stunned.

"Yes, even bigger!"

"God, do you have a giant mechanical civilization? Do you need such a huge fortress?" Wang Dali was shocked.

"Giant?"

Optimus Prime was stunned and said strangely: "of course, mechanical civilization has giants, and it is a planetary giant. We have a mechanical life, which is actually a Planetary Fortress!"

"Just like the emperor of the universe?" Wang Dali asked in a way he could understand.

"Well, it's not like the universe emperor. Well, in fact, you can understand it like this!" Optimus Prime and Wang Dali came outside the energy shield.

"How to get in? Will this energy shield keep us out?" Wang Dali touched the shield and found it very tough.

"Of course, you come to the cockpit in front of my car!"

Optimus Prime opened the front window in front of him, and Wang Dali hurriedly drilled in. Suddenly, Optimus Prime opened his hand, and a light rushed out over himself, wrapped his body and formed a human mask.

"This is also an energy mask. Open it and we can go through it!"

Optimus Prime easily passed through the energy shield of the fortress, just like two water droplets merging with each other.

Light ions spewed out from his feet. Optimus Prime fell on the fortress and stood on a huge steel Avenue in the middle. The avenue was a few kilometers long and could not see the end at a glance.

On both sides of the avenue, there are rows of steel buildings!

Wang Dali jumped out of the window and looked at the city. He saw that the city was brand-new without any rust.

"It's incredible. What kind of metal is it? Why is it so new that it won't rust?"

"This is the unique nide alloy of mechanical civilization. It is one of the scientific and technological formulas continuously improved by mechanical civilization for millions of years. It is most suitable for building fortresses. It is not only tough, but also has many special effects. It will never rust, scratch and be new forever. That is one of its characteristics!"

"I wipe it. It's a magical alloy. Can it be comparable to the vibration gold in maroon?!"

"Vibration gold has some characteristics, Ned alloy has, vibration gold does not have, Ned alloy also has!" Optimus Prime was very proud and said: "in addition to life memory metal, Ned alloy is the best!"

"What you call life memory metal is the metal on you?"

"Yes, every mechanical life body and core component must be this metal. Only this metal can carry the characteristics of silicon-based life!"

Wang Dali suddenly realized that the life memory metal was like the flesh and blood of carbon based organisms.

However, silicon-based life seems to be much stronger than carbon-based life, and its life span seems to be much longer.

Wang Dali feels more and more that human life expectancy is the lowest among many civilizations, but he doesn't know whether it will improve after the level of scientific and technological civilization is improved?

If there is no improvement, then interstellar travel, or interstellar colonization, is tantamount to empty talk!

To explore the starry sky, human beings must break the shackles of life!