Underground bunkers, this is a standard pre-war product. Pen @ fun @ pavilion wWw. ｂｉｑUｇE。 ｉｎｆｏ

In the November War that broke out in 1452 in the Maple Leaf Calendar, the super-powerful Yun Conglong, Bai Hutai, and Ying Tianshu declared war on the huge empire that controlled the entire territory of the Maple Leaf Continent, and single-handedly shook the power of the entire empire. In that eleven months full of blood and death, the Maple Leaf Empire paid the price of eight emperors, 1,741 high-ranking officials above the third rank and their three clans, a total of 43,000 people, 66,000 main troops, and more than 30 million civilian lives, but finally lost the war.

This is the first collision between technology and source energy, ending with the victory of the source energy powerhouse, since then, the empire has to humiliate admit, the three and the later stage of the war stopped waiting, and the other five top powerhouses who took the initiative to join the three-person camp are the victors, they can walk all over the empire at will, and they are not subject to any imperial laws, where they are is their territory, and their will is the supreme law of the territory.

The war ended, but life went on. After this deformed war, the imperial family and the central government of the empire have rapidly reduced their control over the locality, and the territory of the empire is in turmoil, the local army is self-respecting, and the Maple Leaf Continent is in chaos. Of course, other countries that have long coveted the rich resources of the Maple Leaf Continent will not let go of such a good opportunity, and they each take the opportunity to continuously exert pressure on the empire, and the empire has to choose to use force in the midst of internal and external troubles, and the two sides have launched a crazy arms race.

Ten years, from survival to destruction, it took only ten years, and ten years later, the war of doom broke out, and the old humanity came to an end.

In this decade, as the number of nuclear weapons has increased exponentially, countries have felt the imminent crisis of destruction, and it is naturally impossible to reduce the number of weapons, so in the last few years, countries have to invest heavily in the construction of preventive measures, so that when the end comes, they can reserve the last spark for their countries.

As a result, underground bunkers were born.

As the name suggests, underground bunkers are often built hundreds of meters or even nearly a thousand meters underground, using nuclear and geothermal energy as energy sources, and are not affected by the deterioration of the surface environment, which is enough to keep the internal equipment operating normally for a hundred years. This kind of building covers a vast area underground, like a city, and the small ones can accommodate three or four hundred people, and the large ones can even accommodate thousands of people. Inside the bunker, a freezer is prepared for each user to spend long years in a restful sleep of unconsciousness.

In addition, the buildings and facilities that should be used in life are also readily available in the underground bunker, as long as the sleeping residents wake up from the freeze, they can be put into use, and there are also a large number of weapons, food, and material reserves, and the food reserve alone can allow all the inhabitants inside the bunker to survive for at least twenty years. These are all prepared for the life of the inhabitants after waking up, and the awakened residents will try to get out of the underground bunker, use the bunker as a base to expand outward, and eventually rebuild human civilization.

The final result was very different from the original plan, but in any case, the underground bunker plan was carried out normally, and before the outbreak of the final battle, the elites from all walks of life who had been carefully selected were able to enter the underground bunker, and their lives were successfully extended for fifty years as planned. Of course, this has not changed anything, the world is still developing according to the established trajectory, and the old humans are still going to extinction, leaving only underground bunkers, which are still showing the glory of the old humans.

According to the records, there are only 2,431 underground bunkers built on the Maple Leaf Continent on the Four Leaves Star, and more than 1,800 have had time for people to enter, but in the Dark Ages, there are only about 900 underground bunkers that open the gate and return to the ground, that is to say, there are still 900 underground bunkers, which are still unknown and sleeping in all corners of the Maple Leaf Continent, perhaps, they will continue to sleep forever.

In the more than 300 years since the disaster, nearly 200 underground bunkers have been discovered and rediscovered. There is no doubt that the energy of the internal equipment has long since been depleted after such a long period of use, and the inhabitants of the bunker have either died in their sleep, or have not been able to open the door after waking up for various reasons, and finally have exhausted their food reserves, but this does not affect the existence of other things in the underground bunker.

Therefore, the discovery of each underground bunker is a carnival for the discoverer, countless high-quality thermal weapons, a large number of exquisite pre-disaster artworks, industrial and medical equipment that have long been no longer put into production, gasoline, oil, various metal reserves, these things are well preserved in a sealed environment, and can still be used normally even after the past three hundred years. If you're lucky, you'll be able to find astronomical reserves of gold and silver directly in the underground bunkers, enough to turn a poor and destitute creature into a lucky one in the world. Legend has it that Wang Yuan, the richest man in Clockwork City, who has usurped the position of the lord of Clockwork City, was a lucky man who found an underground bunker, as for how he kept this wealth, that is another story.

However, all this wealth is secondary, and the real value of the underground bunker lies in its safety. Each underground bunker is built with several meters of reinforced concrete as the shell, and at least fifty centimeters of artificial tantalum tungsten alloy as the lining, even some powerful terrass beasts, it will take months to break its shell. Therefore, as long as you unfold the concealment shield and get rid of the threat of the wraiths, the Underground Bunker is the safest shelter, and with the Underground Bunker as a backing to expand outward, as long as you have enough population, it is easy to build a new city, at least easier than building it out of thin air. Of the more than 5,000 cities that exist in the Maple Leaf Continent, more than 400 are built on underground bunkers.

There is no doubt that for anyone, unexplored underground bunkers are an unimaginably huge treasure trove, that is, on the Maple Leaf Continent, there are still seven hundred such treasure troves waiting to be excavated by the darlings of fate.

Unfortunately, wealth is not so easy to come by, and the treasure troves of myths are always troubled by troubled guardians, and underground bunkers are no exception. All kinds of automatic defense thermal weapons that are enough to destroy everything are only entry-level threats, and they can already eliminate most of the low-level abilities, although they can use source energy to defend against thermal weapons, but the continuous attack of high-energy weapons will still bring them a lot of trouble, and it is inevitable that after being attacked for a long time, the energy will be exhausted and beaten into a fishing net.

In addition, the nuclear energy leakage caused by the aging of the equipment is a bigger trouble, and high-purity radiation energy is a terrible threat to high-level abilities, they will quietly erode the source energy protection of the ability little by little, so that their soul energy is unconsciously exhausted, and by the time the intruder reacts, the radiation has already invaded their bodies, causing irreparable damage.

However, the really terrifying is the ubiquitous demon spirits, due to the death of a large number of residents, there is often a concentration of source energy in the closed underground bunkers that far exceeds other places, this is the favorite environment of the demon spirits, an underground bunker that can accommodate thousands of people, sometimes there can even be tens of thousands of hundreds of thousands of demon spirits lurking everywhere, even if it is a top ability, if you rashly break into it, I am afraid that even if you don't die, you will have to pay a heavy price.

Therefore, an unexplored underground bunker can be said to be the coexistence of opportunity and death, which makes people love and hate.