When the large number of troops from the special operations base arrived, they saw these four people sitting on the ground in a daze, not knowing all the situation. （）

The Fifty-First Sector was shaken.

It is impossible for the Grand Coulica power station to collapse for no reason, and satellites in the sky also captured a strong release of energy, and after studying the images, but nothing can be seen, this is a high-precision spy satellite, which is extremely unusual.

Bullet holes can still be found on the hill, and the intensity of the battle can be felt from its intensity, which is the United States, it is reasonable to have such a level of fierce fighting, and even four Apache and six Humvees were damaged, and the entire wild dog team was completely annihilated.

The expert group quickly came to the conclusion that the four men had been brainwashed and that they must have seen something that they should not have seen.

The mission?

The expert who knew the inside story suddenly became solemn: Mark had returned home, and Jefferson had suddenly arrived at this temporary base, this event must be unusual!

The scientific research institutions of District 51 were completely mobilized, and they tried to unravel the reason why the four people were brainwashed, while on the other side, Zhang Binhui and Xiaoxue were playing in major scenic spots in the United States.

"This is Yellowstone, the first national park on earth. Yellowstone is known for its abundant wildlife and geothermal resources, and is one of the most famous sights on our planet. ”

Two people walked on the wooden plank road, and at their feet was a colorful pool.

Xiaoxue seemed very happy, pointing at various scenery from time to time, and the two were talking about what they wanted to be happy about, when they heard a "bang", and a column of water sprayed out of the ground from five hundred meters on the right.

"Wow, Honest Spring, it's really honest, it erupted on time!"

A group of tourists cheered, and Xiaoxue also jumped and jumped with them, excited like a child, and couldn't see the heroic appearance before.

Yellowstone is a huge park, reaching almost 9,000 square kilometers, so there are not many tourists here, and the two of them turned around and mixed into a tour group, listening to the tour guide as they walked.

"Yellowstone National Park is located on the border of Wyoming, Montana and Idaho in the United States, and most of it is located in Wyoming, United States.

It was inaugurated on March 1, 1872 by U.S. President Ulysses? Simpson? Established after signing an act passed by Congress, Grant is the world's first national park.

Yellowstone is known for its abundant wildlife and geothermal resources, and the Honest Geyser is one of its most famous attractions. There are many types of ecosystems in the park, with subalpine forests predominantly being the main ones.

Yellowstone National Park covers an area of about 8,983 square kilometers and includes lakes, canyons, rivers, and mountains.

The largest lake in the park is Yellowstone Lake, located in the heart of the Yellowstone volcano, and is one of the largest high-altitude lakes in all of North America.

Yellowstone Volcano is the largest and still active supervolcano in North America, and it has erupted several times in the past two million years with tremendous energy. The spewed lava and volcanic ash also covered most of the park.

Thanks to its continued activity, half of the world's geothermal resources are located in the Yellowstone area.

Yellowstone is also home to the heart of the Greater Yellowstone ecosystem, one of the largest and still nearly intact natural ecosystems in the North Temperate Zone. ”

"Huh? Is there a huge active volcano beneath the park? ”

Xiao Xue's ears were sharp, and she immediately asked after hearing this.

Zhang Binhui smiled, this thing is indeed true, and he also knows it, but most of Zhang Binhui's knowledge is obtained from the movie.

There have been a lot of movies in the United States, many of which predict the eruption of this supervolcano and the end of the world.

The most famous of these is probably "2012". The volcanic eruption in the middle of the movie is about a volcanic eruption in Yellowstone, tearing the earth's tectonic plates into pieces, eventually causing the land to sink and the tsunami to drown the entire world.

In my impression, it seems that most sources say that Yellowstone is the largest active volcano in the world, and it is also a volcano that can bring great disasters to mankind in the future.

"Shall we go down and have a look, then?"

Xiaoxue was even more excited when she heard this, and immediately made a new request.

Zhang Binhui also suddenly realized.

Thanks to his own super abilities, these things can be explored on the spot, right? What is the purpose of book knowledge?

The two of them did what they said, hid in a no-man's land, and performed the escape technique, and the two of them escaped into the ground.

The rock formations in Yellowstone are quite thin, and you can feel the temperature rise sharply after a short dive.

The geological structure here is relatively complex, and the rock layers are very broken, and the cracks form one channel after another under the ground, and the groundwater seeps into the hot rock, and then is squeezed up by the huge pressure underground, which is how the large number of hot springs in Yellowstone Park is formed.

After diving less than 100 meters, the two of them saw an underground lake underground.

It is an underground cave with a large part of it filled with warm water, and the water in the lake is hot, and steam fills the cavity in the upper part.

Because of the constant supply of steam, it is like a large pressure cooker, and the pressure in the cave is very great.

This situation was the first time for both of them, and they were curious, and they used their divine senses to explore the cave carefully, and when they were looking carefully, they heard a sound of "", and the water in the cave rushed towards a place.

The two men went to inspect it curiously, and saw that there was an upward passage at the easternmost end of the underground cave, and the water in the cave was pouring into the passage at high speed.

After seeing it for a while, the two looked at each other and laughed: it turns out that this is how the Honest Fountain came about.

This cave is like the source of the Honest Spring, and its hot boiling water comes from here, because of the strong pressure in the cave, so a large amount of water will be squeezed out of the passage at intervals.

After the pressure was released, the pressure in the cave reached equilibrium, and the honest spring became honest again, waiting for the next pressure imbalance.

Zhang Binhui frowned at Xiaoxue: "Otherwise, let's poke a hole in this end, I dare to guarantee that this honest spring will not be honest in the future." ”

Xiaoxue was so amused by Zhang Binhui that she covered her mouth and smiled: "It's not good, people have to be honest." It's rare to have such a spring, and you must not destroy it. ”

The two talked and laughed, and continued to dive underground.

Along the way, the temperature trend accelerated, and the upwelling hot springs were more in the form of steam, and it was clear that there was a huge heat source underneath, so that all the water could not exist in a liquid state.

When the two of them were escaping, they felt a red in front of them, and a wave of heat was surging.