After half a month, he returned to Tucson City again, and Sun Cheng seemed more cautious than before.

"The University of Arizona? Don't let me down......"

Quietly taking advantage of the darkness to lurk near the campus of the University of Arizona, Sun Cheng calmly searched for a location that was convenient for him to invade the campus while checking the distribution of monitors near the school.

Before returning to Tucson, he spent two days in Carson, Nevada's state capital.

For two days, Sun Cheng was busy looking for clues about the [Tinder Source] everywhere, and hacked the Internet many times.

He not only searched all the records of meteorite disasters recorded in the history of the United States, but also painstakingly searched the Internet for all kinds of information related to "hauntings" and "robots".

But to Sun Cheng's disappointment, he couldn't find any of the commotion caused by the [Tinder Source] on the Internet.

However, he did not find anything suspicious at all, and in the investigation of the meteorite falling from the sky, Sun Cheng found a suspicious clue.

As one of the countries that have suffered the most meteorite attacks on the earth, the United States has preserved a wealth of records about meteorite landings in various states, and many of the small craters are equipped with professional investigation records, but only the investigation of a Bahringer crater called [Balinger Crater] is unknown, which immediately aroused Sun Cheng's suspicions.

Patiently following this suspicious point, he felt more and more that there was something strange in it.

According to Sun Cheng's investigation, the [Bahinger Crater], also known as the "Arizona Crater", is located in a desert in Arizona, is a huge crater with a diameter of 1.2 kilometers and a depth of 180 meters, which is suspected to have been formed by a huge meteorite hitting the earth 10,000 years ago.

There are many introductions about it on the Internet, for example, some geologists believe that the mass of the meteorite that hit the desert in Arizona is estimated to be millions of tons, the impact speed into the earth's atmosphere is between 10~20 km/s, and about 10 million tons of TNT equivalent are released during the impact, which is comparable to a large-yield hydrogen bomb.

It stands to reason that a meteorite of this magnitude hitting the earth is a rare occurrence in a thousand years.

Even though the [Baringer Crater] was caused 10,000 years ago, there is no reason why the U.S. government sent a large number of experts to study the small meteorites that fell in the territory in the past 100 years, but did not study it.

However, the result of Sun Cheng's careful investigation was that he only found out that more than 90 years ago, that is, in 1912, [University of Arizona] had sent a scientific expedition team to investigate [Balinger Crater] at its own expense.

In addition, what did the expedition team find? Who are the members? Have you found meteorite fragments and so on?

I can't find any of these on the Internet!

That's interesting!

The largest crater in the United States, however, has not been able to hand over a detailed investigation report, and even in recent decades, there has been no news that the US government has sent additional experts to investigate it!

What's more, this [Balinger Crater] is still located in Arizona, with Sun Cheng's understanding of the treacherous red spider, he will never set up his base in the suburbs of Tucson City, Arizona, USA after landing on Earth without any reason.

There was no more information on the Internet, so Sun Cheng could only take the risk of sneaking back to Tucson City again in order to infiltrate the [University of Arizona] school and see if he could find more analysis reports on [Baglin Crater].

This is undoubtedly a very risky move!

Yes, after the attack on Davis Monthill Air Force Base on the outskirts of Tucson and the theft of four nuclear warheads, the U.S. government has not relaxed its investigation into the whole thing, although it has not been hidden.

He wasn't sure about anything else, anyway, Sun Cheng had already felt extreme irritability before he got close to Tucson City, and an inexplicable feeling of uneasiness was constantly warning him.

When he infiltrated the city, he saw the National Guard's armed infantry vehicles and helicopters frequenting the streets, and police patrols were commonplace.

Therefore, Sun Cheng is also cautious and cautious, but he is afraid that something will go wrong.

After quickly capturing all the information of the surveillance equipment nearby, Sun Cheng looked around, and when he found that there was a big tree not far from the school courtyard wall, his eyes lit up.

Quietly touching the bottom of the big tree, Sun Cheng jumped onto a branch on the big tree, and then with the help of the branch, he jumped again, and when he landed again, he had already entered the campus of the University of Arizona.

The University of Arizona is the first comprehensive research university in Arizona, this public university receives nearly $700 million in research funding from the National Science Foundation every year, and the university's astronomy, geology, geography, civil engineering and other disciplines have been very strong since the beginning of the school's establishment, which is one of the reasons why Sun Cheng suspects that the scientific expedition team sent by the University of Arizona must have found something when they arrived at the Balinger Crater more than 90 years ago.

The nightlife of American college students is obviously very rich, and although it is already nighttime, students can still be seen coming and going in groups on campus from time to time, forcing Sun Cheng, who does not want to be exposed and attract the National Guard to guard the nearby streets, to be careful to avoid it.

After groping around the campus for a while, I finally found the school library.

Unexpectedly, he found that there was only an ordinary lock hanging on the door of the library, but this thing couldn't stop his invasion at all, his fingers were slightly deformed and inserted into the keyhole, and the next moment the lock was opened, and after entering, the door was closed again, and Sun Cheng walked directly towards the administrator's counter.

After all, it is the library of a world-famous university, and the library of the University of Arizona is still quite large, it is said that there are a total of 2,947,200 books, and there are more than 30 million e-books.

There were two computers on the administrator's counter, and after opening them, Sun Cheng could instantly invade the campus intranet, but he didn't do this, but directly connected to the library's e-book stack and began to search for the materials he needed.

This search took more than half an hour, and to his disappointment, Sun Cheng only found two names named 'Neville Ottavian Brewster' and 'Wallace Wilson Claremont' in the school history stored in the e-book library.

According to the history of the University of Arizona, both of them were professors, one in geology and the other in geophysics and seismology.

The history of the university mentions that they initiated a scientific research project in 1912, and then left the following year, after which their whereabouts are unknown.

No matter how Sun Cheng searched, he couldn't find more information about the two of them.

Sun Cheng, who did not give up, thought about it, and after locking the location of the school history and the geological investigation materials of the University of Arizona through the computer, he turned off the computer, and first manually rummaged through one book after another in the room on the fourth floor of the library where the school history was stored for more than two hours, and only traced that 'Wallace Wilson Claremont' had a son named 'Benjamin Roddick Claremont'.

So he went to the bookcase where the geological materials were stored again, and carefully rummaged through them one by one.

Eventually, the hard work paid off, and in an autobiography called "Interesting Earth" donated by alumni to the school, Sun Cheng found something that interested him very much.

“…… A classmate from Coconino County told me that there was an Indian shrine in Flagstaff, which was said to be a bottomless, kilometer-wide cave that was said to be the place of divine descent. I talked to Professor Brewster about it, and he expressed his interest and told me it might be an unprecedented discovery. Yes, we call it a crater, and if it is true as the Indian legend goes, it is most likely the largest crater in American history......"

In July 1912, Professor Brewster's application was approved, and he was awarded $1,200, which was more than enough money to travel to Flagstaff on vacation. He sent me an offer, but I wanted to buy a car, so I was going to work part-time in the summer, Professor Brewster was a little disappointed but he understood......"

"I didn't see Professor Brewster when I started school, and I inquired and learned that he was still in Flagstaff, and I asked the school for $2,000 again, and I also brought Professor Claremont into the expedition, and the stereotypical professor was gone, which may be good news......"

"Christmas was approaching, and Professor Brewster wrote to tell me that he was very happy that his presentation to the Geological Society of North America with Professor Claremont had caused a great sensation, and that many people had come from Philadelphia, New York, and Washington, D.C., to see our discovery in Flagstaff, especially the fascinating meteorite that he had repeatedly mentioned. He said that a gentleman from the Philadelphia Brotherhood named Vince Mihos Lawson proposed that he apply to the U.S. government to have it removed and hidden for study......"

"Professor Brewster decided to leave his job, and he asked me if I wanted to go with him to study the meteorite, but my father wanted me to go home and inherit his fertilizer plant, so I turned him down, and he was very sad. We kept writing for the next few years, but only for five or six years, and when I asked him for the last time where he worked, and he told me about the Black Gorge, I never heard a reply from him......"

ps：

This chapter makes up for yesterday.,Yesterday's fever hasn't subsided.,After knocking a chapter, the effect of the medicine I ate attacked.,I went to bed.。

Thanks to the two readers of 'Purple Night Black Devil' and 'drtgrt' for their great tips.