When it comes to Black Gorge near Nevada and Arizona, it's not too big, and it's not too small.

Sun Cheng had investigated before he came, and the Black Gorge covered hundreds of square kilometers, but most of the surrounding area was a dry desert area, which was easy to rule out under a desolation.

After arriving at the Black Gorge, after only wandering around for half a day, Sun Cheng found that the clues had been completely broken, and he could only reluctantly turn his attention to the most famous Hoover Dam here.

"Since you're here, why don't you go and have a look, there won't be a single hair missing anyway!"

Although he suspected that the Black Gap mentioned by Professor Brewster, who used to work at the University of Arizona, was here, he didn't think much about the Hoover Dam.

After all, according to the clues he investigated, the mysterious meteorite found in the [Baglin Crater] was transported around 1912, and the construction of the Hoover Dam began twenty years later during the economic crisis in the United States.

"Could it be that I'm wrong? The Black Gap that Professor Brewster mentioned is not here at all? ”

Taking advantage of the already dark sky, Sun Cheng quietly approached the Hoover Dam, but he couldn't help muttering in his heart.

In the past few hours, with the super high maneuverability of the new mech, he has run through all the suspicious places nearby, but he has never been able to find anything suspicious, which makes him a little disappointed.

He had just entered within two kilometers of the Hoover Dam in the dark, and suddenly felt that the [spy template] in his body had captured the surveillance equipment, and cautiously he suddenly stopped.

After hesitating for a moment, Sun Cheng released two sets of insect detectors and flew towards the direction of the Hoover Dam.

Now, even the base that he thought could be used as half of his supply depot for the time being, he couldn't go easily.

Losing the supply point, Sun Cheng can sneak into the weapon store on the bad street in the United States to get some to use, and his other big reliance-insect detector is to use one less one, this thing is simply disposable, although the function is strong, but it can't help but its range is only ten kilometers, and the endurance time is too short, there is almost no possibility of recycling.

The two groups of insect scouts dutifully approached the Hoover Dam little by little and transmitted back the images they had taken.

"Hey, there's so much surveillance equipment installed near the Hoover Dam......"

Not far from the Hoover Dam, on the top of the steep mountain wall on the side of the canyon, Sun Cheng carefully reconnoitred the Hoover Dam with the help of the insect detector released from outside, and began to hesitate to explore the Hoover Dam at night.

After flipping through the data received by the insect detector, he was surprised to find that within two kilometers of the Hoover Dam, the insect detector had captured two or three hundred sets of surveillance equipment, which was even denser than the Davis Mont Mountain Air Force Base he had invaded before.

The Hoover Dam is a vital water hub on the Colorado River, and in addition to dense surveillance equipment, insect scouts have found hundreds of security personnel stationed around the dam.

Judging from the images taken by the insect detector, the security personnel near the dam were not only equipped with a large number of light and heavy weapons, but even anti-aircraft missiles were captured by him.

"It deserves to be an important water conservancy hub in the United States!"

This kind of precaution is also worthy of the Hoover Dam, seeing that the energy of the two groups of insect scouts released by himself is about to run out, Sun Cheng thought about it, and simply came here, so he simply gave them an order to continue to investigate, and directly let them enter the dam through the elevator passage and exhaust pipe.

Like most countries, the Hoover Dam is open to tourists, and I've heard that tickets are cheap and open seven days a week.

It's just that Sun Cheng is like this now, and it is estimated that people will see that there is an indispensable shouting and killing.

'Not my race, grab and dissect', this is probably the common reaction of all Earth countries when they see a lone alien life, and the other party is still a robot.

A group of insect detectors who went down the elevator to the inside of the dam failed to find more, and the scenes inside the dam that were photographed were basically available on the Internet, and Sun Cheng had seen almost all of them.

Intentionally directing it to go around some areas that are forbidden to tourists, who knows that its energy has been exhausted, and I don't know where it fell.

Another group of insect detectors, through an exhaust pipe, actually went directly into the closed area inside the dam, and as a result, they transmitted back a lot of images.

What Sun Cheng didn't expect was that it finally sent back a set of images before the energy ran out, which surprised him.

“…… Wait, there are several hidden passages in the mountain next to the Hoover Dam? ”

Sun Cheng was taken aback by the discovery of the insect detector, according to his investigation, most of the mountains near the Hoover Dam are hard andesite and breccia, and the passages are large and small, and the small ones are obviously for human beings to enter and exit the office, but there are steel rails in several of the huge passages, which are obviously used to transport large machinery, and this discovery immediately made him interested.

"Strange, are these facilities really needed for a water conservancy project? How do you look more like a large military base? Is it ......?"

After suddenly realizing that he might have continued the clue, Sun Cheng endured the excitement in his heart, quietly dodged one monitoring device after another, and went all the way down from the cliff, and soon arrived at a flood pipe under the dam.

The vent leads to the interior of the Hoover Dam, but is controlled by a three-way gate to prevent water from backing up into the dam during the discharge.

However, this did not bother Sun Cheng, because it was the flood season of the Colorado River in April and May, and the Hoover Dam almost always carried out small-scale flooding at night, which gave him the opportunity to sneak into the flood outlet quietly.

Although the jet of water gushing out of the spillway made his scalp tingle, he jumped into the spillway after using his core to calculate the impact force and conclude that he would not be swept away with all his strength.

"Smack!"

The first time, due to lack of preparation, the jet of water that was sprayed in the face rushed out of the spillway and fell below.

After hurriedly crawling out, this time he quickly changed back into the form of a fierce beast, and only jumped in again after seeing the position, and as soon as he entered the floodway, he slammed his front paws into the wall.

"Boom ......"

was violently rushed by the oncoming gushing water, and his body also shook, but this time Sun Cheng was very prepared, but he was not afraid to be beaten out again.

At that moment, he rushed forward step by step, and the short floodway of one hundred and ten meters consumed three or four points of his energy, and finally came to an end.

"Puff ......"

After crossing the first gate through the floodway, Sun Cheng entered a large water tank, which was the dam's transit storage site, and although it was tightly sealed, there were still several pipes to leave.

After judging the direction of the water for a while, Sun Cheng entered one of the pipes, he crawled forward for hundreds of meters, experienced more than a dozen climbs and turns in the middle, and then entered a much smaller reservoir, and then groped around for a while, Sun Cheng quickly forcibly broke the locked outlet above the reservoir, and finally entered the inside of the dam.

The next moment, a strange energy fluctuation from afar, immediately stimulated his [core] to beat violently.

"It's a feeling...... You can't go wrong with it, it feels like life and soul have been sublimated...... It's it, it's the [Tinder Source] mentioned in the attack......"

ps：

1. Thank you for the great reward from the readers of "Little Chrysanthemum Pain".

2. If there is a great reaction from readers who are not used to seeing units such as feet in the book, I will adjust it later, and I will not change it in the front.

3. I changed the name of this chapter.