Group Portrait
The crew of Natural Selection represents a unique collective character in The Dark Forest. They have no single protagonist, no individual complete story arc, but as a group they undergo the most extreme experiment in human nature in the entire Three-Body series -- when a group of the best-educated, most disciplined elite humans are cast into absolute isolation, what do they become?
These crew members were originally elite members of China's Space Force, each rigorously selected and trained. They were frontline warriors in humanity's resistance against the Trisolaran civilization, serving with a sense of mission to defend Earth. Zhang Beihai's hijacking changed everything in an instant -- they went from defenders of Earth to fugitives, from champions of civilization to its orphans.
This rupture of identity is the key to understanding the Natural Selection crew's fate. They did not voluntarily choose to flee -- they were swept into this destiny by one man's decision. This "forced freedom" is crueler than voluntary choice because it strips them of the ability to morally justify their situation. A voluntary fugitive can give meaning to their actions with "this was my choice," but the Natural Selection crew lack even this most basic autonomy.
The Moment of Hijacking: Shock and Awakening
When Zhang Beihai issued the command "Natural Selection, advance to full speed," the entire ship entered maximum acceleration. The crew experienced psychological upheaval alongside the physical impact of acceleration.
Most crew members' first reaction was fury and confusion. They were loyal to the Space Force, loyal to Earth, loyal to human civilization. Zhang Beihai's actions were, in their eyes, unmistakable mutiny -- a political commissar had hijacked a warship, betraying the military, the nation, and the entire species. In a soldier's value system, no crime could be more severe.
However, as the ship accelerated away from the solar system, anger gradually gave way to a deeper emotion -- fear. Not fear of Zhang Beihai, but fear of reality. When Earth became a point of light, when the Sun became just another star, when the entire solar system shrank to an unremarkable corner, the crew began to truly comprehend the meaning of "cosmic wanderer."
This fear soon transformed into a peculiar clarity. Removed from the optimistic propaganda on Earth, removed from society's collective hypnosis, the crew confronted reality with naked honesty for the first time: humanity's fleet truly might be unable to match the Trisolaran civilization. Zhang Beihai's judgment -- however unacceptable its execution -- might be logically correct.
This clarity was agonizing. It required the crew to negate years, even decades, of beliefs and efforts. The slogans about "humanity will prevail," the ideals that inspired them to join the Space Force, the convictions that sustained their daily training -- if Zhang Beihai was right, then all of this was a lie. Admitting this demanded enormous psychological courage, and not everyone could manage it.
The Fleet Pursuit and Convergence
Natural Selection's flight was not a solitary affair. After Zhang Beihai's action, the Space Force dispatched multiple warships in pursuit. The pursuit itself revealed an ironic truth: some of the "pursuers" may have harbored their own impulses to flee. The pursuit ultimately evolved into a complex situation -- certain ships in the pursuit fleet joined the flight.
This dramatic transformation from "pursuit to convergence" reflects the true scale of defeatism within human society. On Earth, defeatism was severely suppressed; anyone who openly expressed defeatist tendencies faced legal and social sanctions. But in the solitude of space, when people no longer needed to maintain social masks, their true thoughts surfaced. Zhang Beihai was not the only defeatist -- he was merely the only one with the courage to act.
As multiple warships converged, a temporary "fugitive fleet" formed. This fleet faced an unprecedented situation: they possessed advanced weapons and technology but no supply base; they had well-trained soldiers but no clear mission; they were products of human civilization but had severed ties with it.
The Dark Battle: The Abyss of Human Nature
The Dark Battle is the defining event in the Natural Selection crew's fate and one of the most devastating passages in the entire Dark Forest.
When the fugitive fleet confronted a cruel reality -- that with existing resources and speed, not all ships could survive long enough to reach another star system -- the Dark Forest principle was verified within humanity itself.
An implicit game theory scenario unfolded regarding whether to attack other ships to acquire their resources (fuel, spare parts, food). This was not an open debate but a silent psychological contest. The commanders and crew of each ship were performing the same calculation: if we don't strike first, will another ship strike us?
This is the classic Prisoner's Dilemma of game theory -- cooperation benefits everyone, but defection benefits the first mover. In the deep-space environment lacking trust, effective communication, and enforcement mechanisms, the foundation for cooperation completely collapsed. More terrifyingly, even if you yourself did not wish to defect, you had to assume the other party might -- this "chain of suspicion" is precisely a miniature version of the Dark Forest state between cosmic civilizations.
The battle erupted in an instant. Attacks between ships occurred almost simultaneously -- proving that multiple parties had been planning preemptive strikes. Natural Selection was destroyed in this battle. Zhang Beihai's final words -- "It's all right. It's all the same" -- became his ultimate commentary on everything: whether exterminated by Trisolarans or killed by fellow humans, the outcome on a cosmic scale is no different.
The Moral Collapse During the Dark Battle
The most disturbing aspect of the Dark Battle is not the combat itself but the psychological process before and after.
Before the battle, the crew underwent a gradual process of moral erosion. Initially, the idea of attacking other human ships was horrifying -- this was not merely murder but a betrayal of human civilization's most fundamental values. But as time passed, resource pressures mounted, and suspicion spread, this option shifted from "unthinkable" to "last resort," and from "last resort" to "rational choice."
This moral descent reveals a profound truth: human morality is not an inherent attribute but a social construction. In an environment with social order, legal systems, and cultural norms, morality can be maintained. But when these external supports are removed -- when people are isolated in the lawless void of deep space -- morality becomes desperately fragile.
Liu Cixin conducts a cruel thought experiment here: if you take the finest people from human society -- well-educated, professionally disciplined, sincerely idealistic soldiers -- and place them in an environment without external moral constraints, will they maintain their moral standards? The Dark Battle answers with a resounding no. This is not because they are bad people, but because in such an environment, the distinction between "good" and "bad" people loses meaning.
The Fate of Survivors
After the Dark Battle, the surviving ships continued their voyage into the cosmic deep. These survivors carried the burden of having killed their own kind, and their psychological state underwent fundamental changes.
First came a strange sense of "liberation." After crossing the moral line of killing, they found that many of the moral anxieties that once plagued them had vanished. This was not because they had become psychopaths, but because an old moral system had completely collapsed, replaced by new survival rules. In this new system, the only standard of value was survival.
Second came profound loneliness. The break with human civilization was now irreversible -- even if they someday had the opportunity to return to Earth, only trial and condemnation would await them. They had become the "Other" of human civilization -- still genetically and culturally human, but morally and psychologically a different kind of being.
Finally came calm adaptation. Having lost Earth-based moral frameworks, they began developing a new value system -- one better adapted to the cosmic survival environment. This system was colder, more utilitarian, placing greater emphasis on collective survival over individual rights. In a sense, they were experiencing an accelerated version of civilizational evolution -- traversing in mere years a psychological and cultural transformation that might normally require millennia.
A Metaphor for Human Civilization
The Natural Selection crew represents a profound thought experiment: if the shell of human civilization is stripped away, what core is revealed?
The answer is unsettling: survival instinct. Not reason, not morality, not culture -- but the most primitive, biologically shared drive for self-preservation. The reason and morality that humanity takes such pride in are, under extreme conditions, merely ornaments on survival instinct. When the environment becomes sufficiently hostile, these ornaments are discarded without hesitation.
This conclusion forms a perfect echo with the Dark Forest theory. Cosmic civilizations relate to each other according to Dark Forest principles because the core driving force of all civilizations is survival. The Natural Selection crew verified this macro theory at the micro level -- when resources are limited and trust is absent, relationships between rational actors inevitably degenerate into zero-sum games.
But Liu Cixin is not entirely pessimistic. Before the Dark Battle, there were indeed crew members who tried to establish cooperation, who tried to maintain moral boundaries. Their failure was not because goodness itself is powerless, but because goodness requires an environment that permits goodness to exist. Deep space isolation stripped away that environment, making goodness a dangerous luxury.
Zhang Beihai's Legacy
Zhang Beihai's death did not end his influence on the crew. In a sense, his ideas continued through the crew's actions -- though in a way he himself might have found unacceptable.
Zhang Beihai was an idealistic defeatist -- his flight was meant to preserve the seeds of humanity, an act of ultimate altruism. But the crew's behavior during the Dark Battle pushed defeatism in a darker direction: from "fleeing for humanity's collective survival" to "killing for one's own survival."
This twisted continuation raises a pointed question: can a noble goal maintain its nobility as it is transmitted? Zhang Beihai's conviction was pure, but that purity could not be replicated. When his actions influenced others, those people reinterpreted his legacy according to their own natures and circumstances. For the Dark Battle participants, Zhang Beihai's legacy was not "sacrifice for humanity's future" but "in extreme environments, all traditional rules can be broken."
Literary Significance
The Natural Selection crew, as a collective character, serves a unique narrative function in the Three-Body series. They are the vehicle through which Liu Cixin conducts his "civilization stress test" -- placing a group of people in extreme conditions to test the resilience and limits of human civilization.
This "collective character" approach is relatively uncommon in science fiction. Most works tend to drive narrative through individual heroes, but Liu Cixin consciously diminishes the individual and amplifies the collective. This choice is deeply aligned with the novel's themes -- on the cosmic scale, individuals are insignificant; what truly matters is the behavioral patterns of civilization as a whole.
The Natural Selection crew's story also subverts the "space opera" subgenre. In traditional space opera, space travel is synonymous with romance and adventure, and crews find self-discovery and meaning among the stars. In Liu Cixin's writing, space travel strips away meaning -- in the endless void, the meaning systems carefully constructed by human civilization crumble, leaving only the most primitive logic of survival. This cold realism is the hallmark of the Three-Body series and the fundamental quality that distinguishes it from most other science fiction.