Excerpt from A Past Outside of Time The Bunker Project: An Ark for Earth Civilization

I.Projected timeframe from exposure of Earth’s coordinates to dark forest strike against the planet: optimistic scenario, one hundred to one hundred fifty years. Average scenario: fifty to eighty years. Pessimistic scenario: ten to thirty years. Plans for the survival of the human race used seventy years as a benchmark.
II.Total number of individuals who would need to be saved: Based on the rate of decrease in world population, the number would be six hundred to eight hundred million in seventy years.
III.Projected course of the anticipated dark forest strike: Using data from the destruction of Trisolaris’s star, a mathematical model of the explosion of what would happen to the Sun if struck in the same way was constructed. Simulations based on the model showed that if the Sun were struck by a photoid, all terrestrial planets within the orbit of Mars would be destroyed. Immediately after the strike, Mercury and Venus would be vaporized. The Earth would retain some of its mass and keep a spherical form, but a five-hundred-kilometer surface layer, including all of the crust and part of the mantle, would be stripped away. Mars would lose a layer about one hundred kilometers thick. Later, all the remaining terrestrial planets would lose velocity due to the material released by the solar explosion and crash into the surviving core of the Sun.
The model indicated that the destructive force of the solar explosion—including radiation and impact from solar material—would be inversely proportional to the square of the distance from the Sun. That is, the destructive force would diminish rapidly for objects far enough from the Sun. This would allow the Jovian planets to survive the explosion.
During the initial phase of the strike, the surface of Jupiter would be greatly disturbed, but its overall structure would be undamaged, including its satellites. The surfaces of Saturn, Uranus, and Neptune would also be disturbed without deeper damage. The dissipating ejected solar material would slow the orbits of the planets down to some degree, but later, as the solar material formed into a spiraling nebula, the angular velocity of its spin would match that of the Jovian planets and not degrade the orbits of those planets further.
The four gas giants, Jupiter, Saturn, Uranus, and Neptune, would survive a dark forest strike relatively unscathed. This prediction was the fundamental premise for the Bunker Project.
IV.Abandoned plans for the survival of the human race
1.Stellar Escape Plan: technically impossible. Humanity could not gain large-scale stellar navigation
 
capabilities within the timeframe required. No more than one-thousandth of the overall population could fit into stellar escape arks. Moreover, it was highly unlikely that such arks would be able to locate and reach habitable exoplanets prior to fuel exhaustion and permanent breakdowns in long-term life support and ecological cycling systems.
As any plan along these lines could ensure the survival of only an extremely small portion of the total population, it violated the fundamental values and moral principles of the human race. Politically, it was also unfeasible, as it could lead to massive social upheaval and the total collapse of society.
2.Long-distance Avoidance Plan: extremely low feasibility. This plan would involve constructing a human habitat at sufficient distance from the Sun to avoid its explosive destructive power. Based on the model and projected development of engineering techniques for hardening space cities in the foreseeable future, the minimum safe distance would be sixty AU from the Sun, which is beyond the Kuiper Belt. At that distance, few resources would be available in space for constructing a space city. Similarly, the lack of resources meant that even if such a city were built, it would be almost impossible to maintain for human occupation.
V.The Bunker Project: the four gas giants could be used as barriers to avoid the solar explosion from a dark forest strike. In the shade of the four planets, away from the sun, sufficient space habitats would be constructed to house the entirety of the human population. These space cities would be located next to the planets, but would not be their satellites. Instead, they would orbit the Sun in synchrony with the planets, staying within their shadows. The plan called for a total of fifty space cities, each of which was capable of housing about fifteen million individuals. Specifically, twenty cities would be shielded by Jupiter, twenty by Saturn, six by Uranus, and four by Neptune.
VI.Technical challenges facing the Bunker Project: The technology required by this plan had all been mastered by humanity. Fleet International possessed extensive experience constructing space cities, and there was already a sizable base around Jupiter. There were some technical challenges that could be overcome within the required timeframe, such as how to regulate the positions of the space cities. Since the space cities would not be satellites of the gas giants, but would have to stay in close proximity of the planets, they would fall toward the planets, unless propulsion systems were installed to counteract gravity and maintain their distance from them. Initially, the plan called for the space cities to be positioned at the L2 Lagrangian points, such that the space cities’ orbital periods would match their respective gas giants’ without needing to expend much energy. However, it was later discovered that the L2 Lagrangian points would be too far away from the gas giants to provide sufficient protection.
VII.The survival of the human race in the Solar System after a dark forest strike: After the destruction of the Sun, the space cities would rely on nuclear fusion as their energy source. By then, the Solar System would appear as a spiral nebula, and the scattered solar material would provide an inexhaustible supply of easily collectable fusion material. It should also be possible to gather more fusion fuel from the remaining core of the Sun, sufficient to ensure humanity’s long-term energy needs. Every space city could be equipped with its own artificial sun that would generate an amount of energy equivalent to the amount that had reached the surface of the Earth before the strike. From an energy efficiency point of view, the energy supply available to humans would actually be orders of magnitude
 
higher than the pre-strike period because the space cities would consume fusion fuel at only one-billion- billionth the rate of the Sun. In that sense, the extinction of the Sun would be an improvement, because it would stop the extremely wasteful consumption of fusion material in the Solar System.
Once the nebula had stabilized somewhat after the dark forest strike, all the space cities could leave their barrier planets and find more suitable locations within the Solar System. It might be advisable for them to depart from the ecliptic plane so that they could avoid disturbance from the nebula while being able to dip into it for resources. Since the solar explosion would destroy the terrestrial planets, the mineral resources of the Solar System would be scattered in the nebula, making them easier to collect. This would make it possible for more space cities to be constructed. The only projected resource limitation on the number of space cities was water, but there was a 160-kilometer-deep ocean covering Europa, providing a source of water greater in volume than the Earth’s oceans, and capable of supplying a thousand space cities with individual populations ranging from ten to twenty million. More water could also be obtained from the nebula itself.
Thus, the post-strike Solar System nebula was capable of supporting over ten billion people in comfort, leaving human civilization plenty of room for development.
VIII.Impact on international relations from the Bunker Project: It was an unprecedented plan  for the entire human race to construct a new world. The greatest barrier standing in its way wasn’t technical, but a matter of international politics. The public was worried that the Bunker Project would exhaust the Earth’s resources and reverse global progress in social welfare, politics, and economics, perhaps even leading to a second Great Ravine. But Fleet International and the UN were in agreement that such danger could be avoided. The Bunker Project was to be engineered entirely with resources from the Solar System outside the Earth, mainly from the satellites of the four Jovian planets and the rings of Saturn, Uranus, and Neptune. There should be no drain on Earth resources or its economy. In fact, once development of space resources reached a certain stage, the project might even enhance the Earth’s economy.
IX.Overall program for the Bunker Project: It would take twenty years to build the industrial infrastructure for extracting and exploiting resources from the gas giants, and sixty years to construct the space cities. The two stages would overlap by ten years.
X.The possibility of a second dark forest strike: The results of the first dark forest strike should convince most distant observers that the Solar System was lifeless. Simultaneously, as a result of the destruction of the Sun, the Solar System would no longer contain an energy source capable of supporting an economical attack from a distance. Thus, the possibility of a second dark forest strike seemed minute. The conditions of 187J3X1 after its destruction also provided support for this view.
 

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