"You may not understand what the word "expansion" means, but the expansion here didn't stop until an hour ago. The tunnel you're passing through now has just been renovated. As the only regular entrance to the Vault, the 7,248-meter-long tunnel is made entirely of half-meter-thick double-layer steel, between which thousands of automatic weapons and a larger number of manual weapons are hidden, as well as some very interesting little things, which will be explained later. ”

"As someone may have noticed, the tunnel is not straight, but has a slight slope, and by the time you reach the Vault, it is about 500 meters underground. About 40 meters of it is soft soil, more than 100 meters of miscellaneous rocks with buffer voids, and nearly 300 meters of stacked angiogonite. And these are vaulted around the shelter. Even if it is hit by a big impact, it will be cushioned by layers of flower rocks, and it will be carved into the large pit next to the shelter in a huge archway......"

The fastest man had reached the end of the tunnel, and the sight in front of him made everyone who saw it involuntarily have a heartfelt shock.

Beyond the tunnel is a huge space with no edges in sight, as if there is an endless universe without stars. At the center of this universe is a mountain illuminated by countless spotlights, a mountain buried thousands of meters deep underground.

This mountain rises from the void, like a magnificent meteorite floating in the universe, and even under the spotlight, it is impossible to see where the foot of the mountain is. Perhaps, as the mission publisher said, in addition to the mountain where the shelter was built, it was surrounded by large craters around it—large enough to fit the entire city above ground.

At the exit of the tunnel is an empty platform hundreds of meters long and wide, and from this platform to the place where the shelter is located, as in the rest of the surrounding area, there is no connection.

Nearly half an hour later, when all the people in the tunnel had arrived, there was a loud rumbling sound in the tunnel behind, and the connection between the platform and the tunnel was sealed.

The ubiquitous voice of the task publisher came out again, "This refuge is called the Temple of the Reverse Heaven, the meaning can be understood by everyone, but this meaning can also be separated, now the platform you are on is called "Reversal", if you want to reach the "Heaven" from here, you have to start from the word Reversal, when I first arrived here, I was also embarrassed for a long time to understand what the Reverse is, I really want to see if you can understand it faster...... It's a pity that there is no time......"

With the end of the publisher's sentence, a strange bridge with LED lights suddenly appeared in the dark void, and the entire bridge was obviously covered with lights, but all that could be seen was these lights, and it was impossible to see what material the bridge was illuminated by the lights, as if the bridge was just a bridge-shaped silhouette composed of these LED lights.

"Don't rush to the bridge, but I'll explain the mission."

The prelude to this overly long and shocking mission has finally come to an end, but the longer mission and even greater shock have only just begun, in the publisher's note.

"Actually...... I'm not from this earth......"

"Actually...... I'm not from this earth...... It's no joke. I wasn't going to make such a big joke either. I am here only because the earth you live on is in danger of destruction. ”

"From now, there are still 4 hours and 37 minutes. In 4 hours and 37 minutes, there will be an alien attack on Earth, the method of attack is unknown at this time, but what we have to do is to successfully defend against the intruder attack for 10 days, and keep me safe during those 10 days. In 10 days, there will be other aliens as reinforcements to help Earth solve this disaster, and will have a chance to make any dreams come true for those who have helped me. ”

"As for whether what I said is true, the fact that everyone from all over the world can understand my words in their native language is the best proof that this technology, which is beyond your understanding, can be provided to the human beings of the earth for free in 10 days."

Many people on the platform shouted loudly, and the jumbled sound almost overshadowed the task publisher.

"Please calm down. You can understand me as the positioning coordinates of space, only if I survive, the role of coordinates will be played, and the reinforcements will be here for 10 days. There is no need to care about the world outside the shelter. Intruders whose first goal is to kill me will not attack the rest of the planet until they have obliterated the threat that originated with me. ”

"In other words, as long as you can protect me for 10 days, you will save the entire earth, and you will become a hero of the entire human race from some shady professions, and you will also receive rewards from both humanity and me. On the contrary, if you fail to protect me, not only will I and you be killed by the murderous invaders, but the entire planet will be destroyed as a result. By the way, from what I know about the invaders, they are a cold-blooded civilization that has a habit of eating other creatures raw. Of course, there is also good news, that is, their combat power is similar to that of humans, and there will definitely be no one-sided situation. ”

"Now, let me explain the battle arrangements for this time. There are currently 18,523 people on mission, each of whom is an expert in killing and combat. I don't expect you to act together, I just want you to find something that works for you. ”

"In the tunnel outside, there are 1,551 automatic weapons that will attack everything that moves in the tunnel when the battle begins. However, due to the unknown way of attacking and fighting the invaders, automatic weapons may not be very effective, or even effective. So there are still 1865 manual weapons in the tunnel, and I now need the same number of people who are proficient in these weapons to control. Those who wish to do so please enter through the side door on the side of the tunnel, which has slides and can reach any location on the mezzanine side of the tunnel in 5 minutes. You can use these slides to attack or retreat flexibly, and I won't ask you how long you hold out, and it's up to you to decide whether to retreat if you can't defend it. But I have a way of knowing if you are fighting hard or not, and this will directly determine what I will give you in return after the war. ”

"I need some people to ...... else"