Manuel Rey Diaz

Manuel Rey Diaz is the Second Wallfacer, a Venezuelan president selected to design a strategy that the Sophons cannot read. His significance lies in the collision between political rebellion and planetary engineering: the same leader who made a small country a symbol of independence attempts to turn Mercury into an instrument of deterrence, accepting that his plan may require impossible resources, mass destruction, and his own death.

Identity and Political Background

Manuel Rey Diaz is presented as a brown-skinned, stocky South American with a stubborn look in his eyes. His appearance matches a public persona built around force, defiance, and political will, but that persona is attached to an unusually successful experiment in national transformation. As president of Venezuela, he continued the Bolivarian Revolution associated with Hugo Chavez and promoted what Chavez called Socialism of the Twenty-First Century. Drawing on earlier international socialist movements, he increased Venezuela’s power across multiple dimensions and temporarily made it a symbol of equality, justice, and prosperity. Other South American countries followed Venezuela’s example, and socialism briefly spread across the continent.

His politics also carried a strong anti-American character. The United States regarded the possibility of a socialist Latin American bloc as a strategic danger and used an accident and a misunderstanding as the pretext for a full-scale invasion intended to overthrow his government. The invasion broke the post–Cold War pattern in which major Western powers repeatedly defeated smaller Third World states. When the US Army entered Venezuela, it found that the uniformed military had disappeared: the army had been divided by squad into the civilian population, turning the country’s apparent weakness into a form of resistance. This history helps explain why Rey Diaz was considered a worthy Wallfacer. His importance rests not only on ideology but on demonstrated courage, foresight, and the ability to make a small state exert disproportionate strategic weight.

Appointment as the Second Wallfacer

The Wallfacer Project arises because humanity’s ordinary plans are completely exposed to the enemy. The arrival of additional Sophons makes Earth transparent to the Trisolarans: meeting rooms, files, computers, military details, and developing deployments can all be observed. Yet the Sophons cannot read human thoughts. The project therefore selects individuals who can keep their true strategy entirely within their minds while presenting false intentions to the world. Rey Diaz’s public reputation becomes part of this machinery of concealment. His political history makes his selection plausible, while the Wallfacer system permits his visible actions to serve as a deliberate mask.

His introduction at the United Nations is marked by the contrast between public office and secret purpose. Luo Ji is surprised to see him there because Rey Diaz rarely appears at the United Nations, but the choice becomes intelligible once his political career is considered. He is both a leader who has already challenged the established order and a strategist whose actions have shown that apparently weaker actors can overturn the expectations of stronger powers.

When Allen asks what can be done for him, Rey Diaz answers with a single objective: designing a nuclear bomb. He requests the largest possible yield, with two hundred megatons as the absolute minimum. The request establishes his method immediately. Unlike a conventional political program, his Wallfacer strategy is not framed as diplomacy, persuasion, or gradual technological development. It begins with the demand for a weapon whose scale exceeds ordinary military assumptions.

The Mercury Strategy

The technological advances of the Crisis Era make Rey Diaz’s plan conceivable. The completion of the space elevator and the breakthrough in controlled fusion encourage humanity, while the exploration of the Solar System expands from Earth’s immediate surroundings toward defensive bases on other planets. Manned landings on Mars and the moons of Jupiter are treated as practical steps toward Solar System defense, and strategic attention increasingly turns to the inner planets. Against this background, the Planetary Defense Council narrowly approves Rey Diaz’s proposal to test a stellar hydrogen bomb on Mercury.

The first projected bomb would yield 350 megatons of TNT, seven times the largest hydrogen bomb previously manufactured by humanity. Such a weapon cannot safely be tested in the atmosphere or in an ordinary underground shaft. A high-orbit detonation would produce an electromagnetic pulse capable of devastating Earth’s telecommunications and power systems, while an underground test on Earth could spread shock waves through geological structures and trigger earthquakes or tsunamis. The logical site appears to be the far side of the Moon, but Rey Diaz chooses Mercury instead and refuses to explain the decision, invoking the principles of the Wallfacer Project.

The engineering effort demonstrates both the material ambition and the physical limits of his strategy. Excavation on Mercury can occur only during the planet’s eighty-eight-Earth-day nights, so the shaft is expected to take three years. It becomes humanity’s first large-scale engineering project on another planet, yet construction reaches only one-third of the planned depth before workers encounter an unusually hard mixture of metal and rock. Continuing would be slower and more expensive. Testing at the existing depth would eject surrounding rock, produce a crater, and become a weakened version of an atmospheric test; the crust would also interfere with observation. The project is terminated, but the failure of the shaft does not end Rey Diaz’s larger design.

The Wallbreaker eventually reconstructs the hidden strategy from astronomical evidence. A collision in the 275E1 planetary system showed that a planet could puncture a star’s convective shell and eject stellar matter into space, where the star’s rotation shaped it into an expanding spiral. The Wallbreaker argues that Rey Diaz intends to stockpile a million or more stellar hydrogen bombs on Mercury. Repeated detonations would act like a turbo-engine, slowing Mercury until it fell into the Sun. Mercury would then reproduce the 275E1 event on a vastly larger scale, punching through the Sun’s outer layers and releasing a spiral atmosphere. As that expanding flow reached Mars’s orbit, it would initiate a magnificent chain reaction. The plan is therefore not merely to destroy a planet or test a bomb; it is to use the architecture of the Solar System itself as a weapon.

Exposure, Defeat, and the Dead-Man’s Switch

The Wallbreaker’s success changes the meaning of Rey Diaz’s apparent secrecy. His public plan is described as a fleet of agile space fighters carrying hundred-megaton superbombs and making a suicide strike against the Trisolaran Fleet. That visible scenario is only the outer layer. Once the Wallbreaker identifies the Mercury strategy, Rey Diaz recognizes that the decisive advantage has shifted to the person who can interpret the evidence behind his performance.

Rey Diaz’s response is not an attempt to deny the plan. When the Wallbreaker asks what follows if the reconstruction is correct, Rey Diaz gives the same answer that Tyler’s Wallbreaker had given in a parallel confrontation: the Lord does not care. The statement is both defiance and acknowledgment. The Trisolarans are not required to respect the rules of the Wallfacer game, and exposure does not automatically make the strategy true, feasible, or dangerous enough to deter them.

The Wallbreaker then attacks the plan’s material foundation. Humanity cannot manufacture the required number of stellar hydrogen bombs; even exhausting Earth’s industrial resources would produce less than one-tenth of the necessary quantity. Moreover, a million bombs would still be insufficient to slow Mercury into the Sun. The Wallbreaker calls the strategy greedy and tragic: Rey Diaz has combined a soldier’s recklessness with the calculations of a superior strategist, pursuing an impossible design step by step. The accusation cuts through the Wallfacer’s public roughness and exposes a contradiction in his method. His plan depends on an immense technological future, yet its credibility also depends on the willingness to proceed as though that future were already available.

Rey Diaz has nevertheless prepared a final mechanism to preserve the threat after his exposure. He displays a large black wristwatch containing a transmitter linked directly to Mercury. Its function is not to send a detonation command but a continuous non-detonation signal. The system, code-named “cradle,” receives the signal on Mercury; if the signal is interrupted, the hydrogen bombs detonate immediately. It is a dead-man’s switch, transforming Rey Diaz’s continued life and communication into the restraint holding the weapon in check. The device converts personal extinction into a strategic commitment: killing him or silencing him would trigger the catastrophe he has designed.

Final Return and Narrative Significance

Before departing, Rey Diaz asks that the Wallfacer Project not be abandoned, calling it a hope amid the war and asking that the remaining Wallfacers be wished well. The request gives his final scenes a striking tenderness that his political and strategic image has largely suppressed. He knows he will not see the other Wallfacers again, and the farewell leaves Garanin in tears.

His return to Caracas is staged as a political homecoming and a terminal procession. Under a clear sky, Rey Diaz descends from the aircraft, smells the familiar tropical atmosphere, and kisses the ground of his homeland. A military-police escort carries him through the capital to Plaza Bolívar, where he climbs onto the base of Simón Bolívar’s statue. Above him stands the armored liberator who defeated the Spanish and attempted to unify Gran Colombia; below, a frantic crowd surges against the police line. Shots are fired into the air, but the crowd breaks through and moves toward Rey Diaz. He raises his hands, tears in his eyes, and addresses the people as their living Bolívar.

This ending binds his cosmic strategy to the history of national liberation. Rey Diaz’s political identity is not discarded when he becomes a Wallfacer; it is enlarged into a planetary version of the same wager. He believes that power can be extracted from an apparently weak position, that technical asymmetry can reverse political hierarchy, and that survival may require a threat so extreme that conventional morality and ordinary calculation can no longer contain it. The later civilization’s environmental degradation, accelerated heavy industry, and projects involving stellar hydrogen bombs, planetary resources, and space dust show the broader paradox surrounding his legacy: humanity responds to existential danger by turning Earth and the Solar System into engineered defensive systems, transferring costs across environments and generations. Rey Diaz therefore remains both a historical actor and a warning about the forms that survival can take when fear, secrecy, and incomplete information govern the future.