Version: Pyramids - As A Shelter After A Supernova Explosion - Alternative View

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Version: Pyramids - As A Shelter After A Supernova Explosion - Alternative View
Version: Pyramids - As A Shelter After A Supernova Explosion - Alternative View

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Video: Version: Pyramids - As A Shelter After A Supernova Explosion - Alternative View
Video: What Will It Look Like When Betelgeuse Goes Supernova? (4K UHD) 2024, May
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The author of this theory is Fisunov Vladimir Alexandrovich. According to him, a number of myths describe at least several catastrophic waves that came to Earth at significant intervals after the explosion of a supernova in Algol 15 thousand years ago at a distance of 28.5 parsecs, or 93 light years from Earth.

Supernova explosion for Earth

What are the possible consequences of such an explosion? This is primarily:

- a powerful stream of hard radiation (from ultraviolet to gamma), which, propagating at the speed of light, reached the Earth already 93 years after the explosion, - an invisible blast wave, consisting of dust, which, moving at an average speed of 12 thousand kilometers per second, hit the Earth, about two thousand four hundred years later, - a heap of space "debris" from the comet-asteroid belt, which revolved around the exploding star, and which was thrown out of the Algol system by a blast wave, - the well-visible, predominantly gaseous component of the supernova envelope, which experienced a significant inhibitory effect from the interstellar medium, “raked” it, thereby increasing its mass by a factor of thousands.

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The first to reach the Earth was a stream of hard radiation from a flared star in the visible, ultraviolet, X-ray, and even gamma regions of the spectrum. Let's see how dangerous he was for the inhabitants of the Earth.

The power of the stream coming to the Earth:

1051 (erg / s) / 1041 (cm2) = 1010 (erg / (s * cm2))

The power of solar radiation is only 1.4 * 106 erg / (s * cm2) or several thousand times less! Moreover, most of the radiation spectrum of a supernova lies in the ultraviolet and X-ray regions invisible to humans (in the visible part of the spectrum, the supernova was several thousand times inferior to the Sun in brightness) and one could admire it, completely unaware of the danger posed by the ultraviolet region spectrum.

If you observe the operation of an electric welding machine from a close distance and without protective glasses, in which the level of ultraviolet radiation is only slightly increased, then after 6-8 hours sharp pains in the eyes begin, photophobia and tearing of the eyes appear. And here is an incomparably higher level of ultraviolet radiation! It can be analogous to radiation from a nuclear explosion at a distance of several kilometers.

Loss of sight after viewing such fireworks by an ancient man is inevitable! And then the shock and numbness caused by the sudden onset of blindness! All this was aggravated by skin burns. It is possible that during the period of the supernova's maximum brightness, which came a few days after the explosion, people burned out like candles, leaving behind only a charred body, as was the case in Hiroshima and Nagasaki, when the Americans dropped atomic bombs on these cities and burned out peaceful population. Whether there was such charring 15 thousand years ago, or not, should be shown by studies of the corresponding sedimentary layers.

As for X-rays and gamma rays, they are very strongly absorbed by the earth's atmosphere, so their impact, hardly, had any catastrophic consequences and it manifested itself mainly in the ionization of the upper atmosphere.

Naturally, such events could not remain unnoticed by ancient man. Stories about them were passed down from generation to generation in order to warn descendants that one should not look at such things without providing a way to protect both the eyes and the whole body. And such a warning remained in the myths, moreover, it is connected not with some abstract star, but, specifically, with Algol!

The second wave from the supernova posed a much greater danger to the inhabitants of the Earth. They had time to prepare for the coming catastrophe, because, moving at a speed of about 12 thousand kilometers per second, the second wave reached the Earth's surface two thousand three hundred years after the first - 12 600 years ago.

This is in perfect agreement with the time of the death of the Clovis culture. As for the mythical side of the matter, it is very likely that Plato's stories about Atlantis, destroyed by a terrible cataclysm, at about the same time, are connected with the second wave from the supernova.

The third wave was not as uniform as the others, as it consisted of comet and asteroid debris that surrounded the exploding star. Unlike massive stars, they were easily accelerated by the incident supernova shell, crushing them into small shrapnel, which flew at speeds lower than the initial speed of the second and fourth waves, but, unlike the gaseous shell, this shrapnel was practically not decelerated by the interstellar media, and therefore, it reached the solar system much earlier, which dispersed it, the gaseous shell.

The fourth wave should have reached the Earth much later, since it consisted mainly of clouds of gas and was strongly inhibited by the interstellar medium. The rate of such deceleration can vary considerably depending on a number of factors, for example, on the density of the interstellar medium, the unevenness of the filamentous structure of individual clouds of the envelope, magnetic fields, etc.

Pyramids as protection

Meanwhile, the moment when the explosion itself was seen on Earth (about 15 thousand years ago) and the moment of the arrival of the second wave (12.5-13 thousand years ago), which initiated a secondary wave in the atmosphere, about two and a half thousand years passed. Ancient people had the opportunity to take appropriate measures to save, if not the entire civilization, then at least some of its representatives.

And here a lot depended on the level of their development. If 13 thousand years ago humanity really did not differ much from a flock of monkeys, then it could only contemplate its death, which it did not even suspect until the moment of the catastrophe. But if the level of development of that civilization was comparable to the level of development of modern civilization, then some rescue measures could be taken, although, of course, there could be no question of universal salvation, since the rampant of the elements caused by the second shock front.

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The designers and builders faced a very daunting task - since it was impossible to create a protective shield for the entire Earth in two and a half thousand years, it was necessary to build a network of ultra-reliable shelters, at least for the elite. Since at the beginning of the design and construction, which began hundreds of years before the disaster, there were too many unknowns, it was impossible to create a shelter that would give a 100% guarantee of the salvation of the people hiding in it.

The main uncertainty was the exact time of arrival of the blast wave, which could vary significantly, given the inaccuracy in determining the speed of propagation of the blast wave. Without knowing the exact time of the disaster, it was impossible to determine on which side of the Earth the shock wave would fall. Therefore, construction had to be carried out all over the Earth in the expectation that someone would still be able to escape.

It was not difficult to suppose that the practically flat front of the shock wave that fell on the Earth should cause three secondary shock waves. This is due to the fact that both the earth's surface and its atmosphere are spherical, and therefore the impact was not simultaneous neither on the surface of the atmosphere, nor on the surface of the ocean and the earth's crust.

First, it fell to the point for which Algol was at its zenith, and then, with a slight delay, to neighboring areas of the ocean surface. With increasing distance from the epicenter, the power of the blast wave per unit of the earth's surface decreased due to a decrease in the angle of attack. All this created the preconditions for the appearance of a horizontal component of the shock wave in the air, water and the earth's crust, which caused these secondary waves.

Those whose shelters were located on the opposite side of the Earth from Algol had the greatest chances. In this case, the secondary waves, which should have circled the globe several times, were significantly weakened. Nevertheless, even on the side of the Earth, which at the time of the catastrophe was turned towards Algol, there was also a chance for salvation, although it was far from the same in its various places.

To make it clearer, I'll give you a simple example

A kind of analogue of such a catastrophe, only on a much smaller scale, was the explosion in the Pokamennaya Tunguska area in 1908, when a forest fell out on a huge territory located in the immediate vicinity of the explosion site. And only in a small area in the very center of the explosion were the tree trunks left standing. This happened because the blast wave came strictly from above, and, therefore, its lateral component in relation to the tree trunks was small.

In the same way, at the moment of the catastrophe associated with the arrival of the second blast wave from the supernova, the greatest chances of not being destroyed, strange as it may seem, were those shelters to which the shock wave came almost vertically from above. In this case, the entire load fell on the rocky base of the shelter and the horizontal component of the secondary shock waves, which is the most dangerous for such shelters, was significantly weakened, be it a shock wave in the atmosphere, a tsunami wave or a seismic wave.

13 thousand years ago Algol, as a result of the precession of the Earth, was located several degrees north of the celestial equator. Therefore, the epicenter of the impact should have been in the equator, but this time on the earth. The construction of shelters was most rational in a rather narrow near-equatorial zone, where there was the greatest chance that the shock wave would come from above, and not from the side.

High latitudes in this respect were not suitable for the construction of shelters on them, since no matter where the secondary blast wave came to them, it will always have a sufficiently large lateral component. In addition, since the blast wave carried away part of the earth's atmosphere, the atmospheric pressure after the disaster dropped sharply, which inevitably should have led to a global cooling, which could easily freeze the survivors of the disaster. Even if they managed to survive, such people would find themselves in terrible conditions, similar to the conditions of life in Antarctica.

Therefore, the optimal areas were located at latitudes no higher than 30-35 degrees. And since there is much less land at 30 degrees south latitude, such shelters were located mainly in the northern hemisphere.

At first glance, it seems that the safest should have been underground shelters, which are not so afraid of lateral components from blast waves in the atmosphere and tsunami waves, although, of course, the seismic wave is somewhat more dangerous for them than for ground shelters. But underground shelters in the event of such a global catastrophe have a number of serious disadvantages compared to ground shelters.

One of these disadvantages was the disproportionately large labor costs for the creation of an underground shelter in comparison with its above-ground version. After all, it is always much easier and cheaper to build a ground building from huge stones than to gouge a shelter comparable in volume in very hard rocks. Moreover, you have no guarantee that at the end of construction, and even worse at the time of the catastrophe, it will be discovered that the rocks had some kind of hidden defect, which will manifest itself at the time of the passage of the seismic wave.

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But an even greater disadvantage of underground shelters was a very high probability that after a disaster it would be under a multi-meter layer of mud and debris brought here by a blast wave in the atmosphere and a tsunami wave. In this case, the fate of people who escaped the disaster will be even worse than the fate of those who died in it, since they will be buried alive and will have no way to get out of their shelter to the surface.

The construction of exits to the surface, which can withstand catastrophic destruction, in terms of their labor costs, will be commensurate with the construction of a ground shelter. It was much easier to build a powerful ground shelter, the exit from which was at a considerable height and could not be littered with debris.

Nevertheless, since underground shelters gave some chance of salvation, ordinary people had to use it, hiding from a disaster in underground shelters, caves, catacombs. And it must be assumed that a certain number of people were saved precisely in such shelters, hardly adapted for this. It is no coincidence, apparently, that the first Christians, who were expecting the next Armageddon, had an inexplicable addiction to the catacombs, caused by their genetic memory.

Those who were clothed with regalia and power built for themselves and their closest circle of shelters that provided the greatest chance of salvation. It is difficult to say whether underground casemates were located under them, which reduced the reliability of such shelters, but it makes sense to mention some of the fundamental features of such shelters.

Ancient designers had to solve several problems at once, because it was necessary to build shelters that would protect from a shock wave, a subsequent tsunami, a sharp drop in atmospheric pressure and, associated with this, a cold snap. In addition, the shelter must be very seismically resistant.

The most effective form for such shelters is a pyramid, which perfectly withstands the blast wave in the atmosphere that must come from somewhere above. Better yet, it can withstand a huge tsunami wave. The edges of the pyramid were supposed to be located at as large angles as possible to one or the other waves, just as is done when creating modern armored vehicles. This is achieved by tilting the edges at 45 degrees. Considering that the blast wave is still more dangerous than the tsunami wave, the tilt angles of the pyramid's edges increased to 50-60 degrees.

A big problem was the reliability of the entrance doors, because no door could withstand the explosive impact, and the builders were forced to replace them with granite plugs. But even they could not withstand the direct impact of the secondary shock wave in the air. It was necessary to minimize its effect on the granite plugs, which was achieved by their location on the side of the pyramid from which the blast wave could not come, while the plane of the granite plugs should be as perpendicular as possible to the blast wave front.

This could be achieved by slightly shifting the construction site of the pyramids from the latitude at which Algol was supposed to be at the time of the catastrophe, and since most of the shelters were to be located in the northern hemisphere, they needed to be located 20-30 degrees north of the equator. In this case, regardless of the time of arrival of the blast wave on Earth, secondary waves could come from the south, east or west, but not from the north. By locating the exit on the northern side of the pyramid, the builders minimized the threat of destruction of granite plugs to the maximum extent.

For this, the entrance corridor had to be located as parallel as possible to the front of the blast wave. For 20-30 degrees north latitude, the maximum power of the blast wave per unit area was when Algol was located directly above the shelter, while he was at an altitude of 60-70 degrees above the horizon line.

In this case, the front of the shock wave is inclined at an angle of 20-30 degrees to the surface of the Earth, therefore, the entrance corridor should be located at the same angle so that the force of impact on the granite plug is minimal. As can be seen from the figure, at such angles of inclination of the pyramid faces, the inclination line of the entrance corridor (yellow) is practically parallel to the front of the shock wave (red line), the effect of which on the granite plugs becomes minimal.

Such an arrangement of the entrance corridor made it possible to solve the second important problem associated with the entrance to the shelter, namely, it was possible to locate the exit at a sufficiently high height, which would allow getting out of the shelter after a disaster without any problems.

It was also important that if the entrance was located on the northern side of the pyramid, the pyramid itself served as an excellent shield against dirt and debris carried by the tsunami wave coming from one of the southern directions. In this case, the amount of debris on the northern side of the pyramid was significantly less than on the other sides of the pyramid (naturally, if the tsunami wave came from the southeast or southwest, on the opposite side of the pyramid, there was also quite a bit of debris, but to predict which it will be a side, at the beginning of construction it was practically impossible). This made it possible to significantly reduce the requirements for the height at which the exit from the pyramid was to be located.

Taking into account that the entrance had to be located at a considerable height, and the entrance corridor had an inclination of 20-30 degrees, the size of the pyramid had to be significant, which in turn increased the thickness of the walls and, accordingly, the protective properties of the shelter, increasing the likelihood of a favorable outcome for people hiding in it.

As noted above, the pyramid is the optimal shape for both above-ground shelters and exits from underground shelters. Since they knew about the explosion in advance, the ancients had the opportunity at the very least to prepare for it. All over the world they had to build many pyramids. Indeed, ancient pyramids are found in the most unexpected places.

In addition to the well-known pyramids of Egypt, Mexico, Guatemala, Honduras and Peru, they were found in China, Crimea and a number of other places. In our country, such shelters have too few chances to survive for several tens of thousands of years due to the destructive effects of severe frosts on them. All that could be left of them was the foundations covered with a thick layer of debris and debris. Therefore, it is possible to discover the remains of the pyramids in Russia only with a careful and purposeful search, which until now has not been done by anyone.

It is useless for official science to ask how the representatives of ancient civilizations so distant from each other, unable to come to terms with each other, managed to build identical structures on the continents separated by an insurmountable water barrier in the form of the Atlantic and Pacific oceans.

There is only one possible explanation - on Earth, long before modern civilization, which is approximately 5-7 thousand years old, there were other highly developed before catastrophic civilizations. But such an explanation is unlikely to suit representatives of various scientific confessions, who have managed to turn the history of human civilization into a huge house of cards. If you pull out at least one card from such a structure, it will collapse and bury many of its would-be builders under its wreckage, who invented and postulated many frankly delusional ideas. Someone did it for mercantile reasons, someone was afraid to tell the truth, because they would make a laughingstock out of him for the entire "scientific world", and someone purposefully lied to achieve their own, purely selfish, political goals.

To achieve such a synchronicity in hushing up the truth about previous high-tech civilizations is possible only if there is some kind of coordination center, whose leaders pursue their own selfish goals, which fundamentally contradict the interests of most of the inhabitants of the Earth. After all, the repeated death of all previous civilizations, no matter how powerful they were, is a very important lesson for us, which these people are trying to hide by all available means. Without knowing this lesson, we will not be able to properly prepare for the coming disasters that will sooner or later occur on Earth.

Therefore, we will not look around at the shouts of those who have already prepared warm places for themselves in the already built ultra-reliable shelters - a fed up hungry is not a decree, but we will try, as best as possible, to study the experience of our ancestors! And we will start considering it with the most preserved at the moment ancient structures used as shelters - the Egyptian pyramids, which fully meet the requirements put forward in the previous chapter, based on the possible direction of the arrival of a supernova blast wave in the Algol system 15 thousand years ago.

Refugees should:

- have an angle of inclination of the edges of 50-60 °.

- the entrance to them should be located on the north side.

- the descending corridor leading from the entrance to the inside of the pyramid has an inclination of 20-30 °.

From most of the pyramids, even in Egypt, which is especially favorable for this, only ruins remained. In a more or less undamaged state, not so many of them have survived. Of those that have survived, the most interesting are three pyramids from the Giza complex (Cheops, Khephren and Mikerin), two pyramids at Dashur (Red and Broken) and the Medum pyramid.

The most famous is, of course, the great pyramid of Cheops at Giza. Its base measures 230x230 meters. The height, initially, was 146.6 meters, but for some reason it lost its upper ten meters of masonry (only on the southern side several blocks from the next row were preserved). Almost 300 cubic meters of limestone blocks, about a meter high and weighing about five tons each, have disappeared, it is believed, already in "our" time.

Where huge stone blocks from the top of the pyramid could "teleport" is completely incomprehensible. They could not fall under their own weight - no earthquake could move the multi-ton stones from the center of such a platform by a good five meters, without destroying the pyramid itself. It would be the height of folly for humans to pull stones from the top - there are many more affordable sources of raw materials for construction around. There is only one possible option - a huge lateral force - a secondary shock wave in the air, which swept away the least durable part of the pyramid. The powerful tsunami wave that arrived much later completed the shock wave.

A significant lateral impact on the pyramids at Giza is evidenced by the destruction on the small companion pyramids of the Pyramid of Mikerin, shown in the figure. It is clearly seen that the most serious destruction took place on the northern and northwestern sides of the pyramids. It seems that the destruction was caused by a blast wave that came either from the north or from the northwest, which, in the case of a supernova explosion in the Algol system, is hardly possible, since the wave should have come from somewhere in the south, and not from north.

Companion pyramids (filmed from the northeast side)

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Really, the companion pyramids suffered as a result of a completely different disaster? In principle, this is also possible, since the three companion pyramids located next to the pyramid of Mikerin could have been built on the model (or they themselves served as such a model) of the three great pyramids by representatives of another civilization, which either did not have such a powerful technical base, or did not need such powerful shelters.

In this case, it becomes clear why it was necessary to build both great and small pyramids on the same site (for example, if the pyramids are just super-strong exits from underground shelters, then for their reuse it was necessary to make new entrances in the form newly built pyramids). The great pyramids were built to protect against a supernova explosion in the Algol system, which occurred at a distance of 28.5 parsecs, and the smaller ones were built, for example, to protect against the explosion of a second star, the Gorgon, which occurred at a distance of 100 parsecs.

And, since the power of the blast wave that passed a distance of 100 parsecs is approximately 10 times less than that of the one that came from a distance of 28.5 parsecs, then the sizes of the pyramids, on which their protective properties depend, are also different. True, in this case, the small pyramids should have suffered from both the first and the second blast waves.

Since the second wave (from Algol) was much more powerful, the main destruction should have been caused by a blast wave coming from one of the southern directions. In addition, the remains of the southern row of masonry at the top of the Cheops pyramid indicate that not the southern, but its northern part was damaged to a greater extent. Those. the destruction of the pyramids in the Giza complex occurred as a result of the unidirectional effect of a certain force on all the pyramids at once.

This synchronicity makes the presence of a human factor (pulling apart stone blocks) unlikely.

So could a blast wave coming from a southerly direction have produced the destruction seen in Figure 2.2? Considering the fact that the first impression is often not entirely correct, let us consider which side of the pyramid should undergo the greatest destruction in the event of a wave arriving from the southwest direction of Fig. 2.3. The red arrows show the direction of arrival of the blast wave (in this case, we do not take into account a significant vertical component!), Green - the projection of forces acting on stone blocks located in different edges of the pyramid.

Distribution of loads on various edges of the pyramid.

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As can be clearly seen from the figure, the southwestern (SW) corner of the pyramid has the greatest load, but … The stone block located on the southwestern side of the pyramid has nowhere to go - it rests against other stone blocks that take on the main load and do not allow him to move to the sides. At the same time, the stone block located on the north-western side, although it experiences less stress, is supported only on one - the eastern side. From the northern side, it has nothing to rely on, but, meanwhile, there is a significant northern component that pulls out such a block from the masonry.

A similar story was, as we remember, in the case of the forest felling after the Tunguska explosion, when all the trees were felled, except those that were in the epicenter of the explosion. So in our case, the northwest side was destroyed to a much greater extent than the southwest.

It follows from the figure that the blast wave, which caused damage to the companion pyramids (and demolished the top of the Cheops pyramid), came not from the northwest, but, most likely, from the southeast! At the same time, the blocks dropped from the top caused additional damage to the north-western side of the pyramid, which are clearly visible on the left (in the picture) pyramid. The epicenter of the explosion, most likely, was somewhere in the Pacific Ocean. This is confirmed by the fact that there is evidence (for example, in Ollantaytambo) that a number of megalithic structures in South America were destroyed by a huge tsunami that came from the west, the height of which reached several kilometers.

However, let's get back to the pyramid of Cheops. The angle of inclination of its lateral faces (52 °) lies within the limits required for the shelter (50-60 °). The entrance to the pyramid (1 mx 1.2 m), as expected, is located on the north side at a fairly high altitude. A descending corridor runs from it at an angle of 26.5 °, which fits perfectly into the requirements (20-30 °) for shelters.

The second pyramid of Giza, the pyramid of Khafre, which has a base of 215x215 meters, meets these requirements just as well. Its height is 143.5 meters. The angle of inclination of the edges is about 53 °. The entrance to the pyramid is located on the north side, at a height of 15 meters. From it there is a descending corridor at an angle of 26 °. Those. again, three basic requirements for shelters are fulfilled.

Even the "smallest" of the three great pyramids of Giza, the Pyramid of Mikerin, also adheres to these requirements. Its base is 108x108 meters, its height is slightly more than 60 meters. The angle of inclination of the faces is about 48 °. The entrance to the pyramid is located on the north side, high enough above the ground. From it there is a corridor descending at an angle of 26 °.

It is impossible to imagine that such coincidences of design features are completely coincidental. Moreover, other great pyramids of Egypt have similar oddities.

So the dilapidated Medum pyramid with a base of 144x144 meters, initially, had a height of 118 meters, which corresponds to the angle of inclination of its edges at 58.5 ° and consisted of a number of steps, two of which are currently under the ruins surrounding the pyramid, two more are visible miserable remains, and from the fifth there is only a ledge that rises about 45 meters.

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Several more steps of the Medum pyramid were completely destroyed (and the human factor here, too, is unlikely - to pull apart the pyramid in pieces is no less difficult work than its construction, therefore the destruction of the upper steps of the pyramid is the result of lateral forces from the blast wave and the subsequent tsunami). The entrance to the pyramid is, as it should be, on the northern side of the pyramid, at a height of about 20 meters from the base of the pyramid. From the entrance there is a descending corridor that descends by 27 meters.

Two pyramids in Dashur do not deviate from these canons - Red (northern) and Broken (southern). The red pyramid (base 220x220 m, height 104 m) got its name due to the fact that the limestone from which its internal masonry is composed has a reddish tint. The angle of inclination of the faces is about 45 degrees. The entrance to the pyramid (1 mx 1.3 m) is located at a height of 31 meters on the northern side of the pyramid. From it, just as in the previous pyramids, there is a descending corridor.

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The broken pyramid (base 190x190 meters, height 104.7 meters) got its name because at a height of 47 meters it changes the angle of inclination of its edges from 54.5 degrees to 43.35 degrees. But unlike the pyramids described above, the Broken Pyramid has not one, but two entrances located high above the ground: one on the north and the other on the west side.

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It makes sense to dwell on the features of the Broken Pyramid, since it stands out sharply from other pyramids. To explain the reasons for the change in the angle of inclination of its edges during construction, usually two possible reasons are given, but none of them is credible. The first reason is that the Broken Pyramid began to collapse during its construction due to an unreliable foundation. In this case, it is completely incomprehensible why, after an even greater increase in the load on the foundation at the end of construction, it ceased to collapse.

And the second - because of a possible accident during the construction of the pyramid in Medum (the slope of its edges is 58.5 °), when the outer layers of the Medum pyramid collapsed as a result of prolonged rains. But this version cannot be taken seriously, since the destruction of the Medum pyramid did not occur during its construction, but much later.

In contrast to these versions, the assumption of a supernova explosion in the Algol system allows you to give your own - a much more logical explanation. Moreover, here, too, various options are possible.

For example, the reason for the changes could have been the data on the coordinates of the future epicenter of the explosion, which had been refined during construction, which had been going on for tens, if not hundreds of years. If at the beginning of construction the designers proceeded from the fact that it was necessary to provide maximum protection against a blast wave in the air (hence the increased level of inclination of the side faces), then when the height of the pyramid under construction reached 47 meters, it became clear that the blast wave would not from above, and from the side and the builders had to significantly reduce the angle of inclination of the faces, which increased the strength of the top of the pyramid. Refined data on the epicenter of the explosion also caused the appearance of the second exit from the pyramid.

Another possible explanation is that, since there were several nearby supernova explosions, the pyramids were also used more than once as shelters (we cannot exclude the possibility that the pyramids were originally built for completely different purposes, and their secondary use as shelters found much later), and therefore were rebuilt several times.