After a pause, Roland continued, "To be honest, before this, this legend seemed a bit absurd, and there was no such thing as "Iron City" in the legend of the Indians.

So the doctor also hates doubts, but now we are standing here, how do you explain the phenomenon of the compass failure?"

The roles played by Lin Feng have always been just bystanders of the expedition team. He has never participated in any archaeological operations of the expedition team. This time, Roland explained to Lin Feng not because he is knowledgeable, but because everyone is powerless now, but Lin Feng seems to have no influence at all.

"Here..." Lin Feng looked like a pedantic and slowly guided the other party, "At this altitude, what is worthy of a civilization with backward productivity to build such a majestic iron city?

What is the purpose of building such a city?"

"Isn't this the reason for our trip? We want to solve this puzzle." Roland replied.

At this time, Olivia came over with a packet of plasma and shouted at Roland without hesitation, "Young man, save some strength, don't let your heart bear it."

Lift your arms up and I'll inject you with plasma."

Roland did not dare to neglect, so he stretched out his arm obediently and let Olivia pierce the needle into his arm.

Lin Feng dragged his chin and thoughtfully, continuing the topic just now: "Iron City, at such a height, building requires unimaginable price. What kind of profit is worth doing so?

What does that sentence mean when communicating with the gods?”

Hearing this, Roland's eyes lit up and said, "'The place where we communicate with the gods'? Altitude!? Flying away from the earth? Perhaps this is a space city! The purpose of establishing this city is to break free from gravity!

Flying out of the earth at such a high altitude can save a lot of fuel, right? If the spacecraft frequently rises and lands, the fuel saved is enough to support the construction of a city, right? ‘Where is the place where mortals communicate with gods’, does not mean flying into the sky!”

Lin Feng shook his head and said, "It's not enough here. At this height, it's hard to imagine the energy expenditure alone. How many flights can be supported by these expenses alone?

And how much energy is needed to maintain such a big city?"

Roland fell silent again after hearing this, and echoed, "Yes, energy is a big problem, unless there is some natural energy here and rich reserves, otherwise..."

If someone observes Lin Feng at this time, he can catch a trace of old fox-like cunning from his eyes.

He continued to induce that "this energy is definitely not a modern conceptual energy. If so, we would have discovered it and started to use it."

So what can be used as energy for hundreds of thousands or even millions of years ago, but now it cannot be used?

Light, wind, magic? or something?”

"Lin Feng, the more you say it, the more absurd you become." Roland retorted with some dissatisfaction, but at this moment, Lucy suddenly said something.

"Calling power!"

At this time, Lucy had already injected plasma and her spirit recovered a little. She said, "Before coming, my uncle had said this word, do you think it's possible?"

"What?" Roland looked confused.

"I mean calcification, which is the most expensive and rarest metal on the earth. In the long evolution of the earth, calcification has long disappeared, so there is no natural calcification element now."

Lucy continued to answer, "My uncle talked to me about this speculation as if he was joking. He believed that at the beginning of the birth of the earth, the earth's content was very rich, but later, during the evolution, it gradually decayed into other metals.

The metal we see now is all caused by whip throwing.

So is there a civilization, a non-Earth civilization, where the planets they live in are much higher than those of the earth and their lifespan is shorter than ours, so the elements in their bodies are elements we have never seen.

It can be considered that the elements that make up their bodies are relatively primitive and have a relatively large molecular weight, while the radioactivity we usually think is just a normal phenomenon for them?

So they flew away from the earth to find a new home, and the humans they left behind slowly adapted to the current environment and evolved into a new civilization - Earth civilization."

Although, the number of ingredients is very, very rare at present.

But for the earth, it is an indispensable metal. It has unique characteristics and extremely practical value. Scientists have said that if atomic bombs are made with carbides, it only takes the size of an ordinary rifle bullet to achieve the same power.

Of course, the field of utilization of turbines is far more than just military. In medicine and other aspects, a few developed countries have used turbines and achieved many amazing medical research results.

So after hearing this, Roland fell into deep thought for a long time.

After a long time, Olivia pulled out the needle and woke him up. He looked up and looked around. Only Lin Feng was still by his side. Everyone else had already entered the tent to rest.

"Maybe..." Roland said unconsciously, "Lucy said a possibility, maybe, this possibility really exists? By the way, why don't you rest?"

"I'm staying here to tell you two news."

Lin Feng looked calm and said, "Two news, one is good news and the other is bad news. Which one do you want to listen to first?"

"Don't talk about those for now."

Roland seemed to be not on Lin Feng. He interrupted Lin Feng impatiently and asked, "Tell me, can you get the needle?"

"Self-needle." Lin Feng asked half confused and half curiously, "What are you doing for that thing?"

"Because, only the rays of the needle can penetrate the sea and the deep layer of the earth, and it is easy to understand the various minerals under the strata.

We are standing here now, making all kinds of guesses is useless, but as long as we have needles, we can solve all our doubts!"

"What makes you think that I, or Sir Miles, have the financial resources to buy needles? You must know that his value is an astronomical number that ordinary people cannot imagine. Yes, it is the astronomical number that cannot be counted by the fingers. Where did you get the confidence?"
Chapter completed!