What REALLY Happened to American POWs in the Hanoi Hilton — Years of Torture in North Vietnam

On August 5th, 1964, Navy Lieutenant Junior Grade Everett Alvarez Jr. was shot down over North Vietnam. He ejected from his A4 Skyhawk, parachuted into the sea, and was pulled from the water by North Vietnamese fishermen. He was taken to a prison in the center of Hanoi, a French colonial fortress called Ho Lo, which translates to fiery furnace.
The Americans who followed him there would give it a different name. They called it the Hanoi Hilton. Alvarez would spend 8 years and 7 months in captivity. He was the first. He was not the last. Over the next 9 years, more than 700 American military personnel would be captured and held as prisoners of war in North Vietnam. Most were pilots and air crew.
Men shot down during bombing raids over the North. They were taken to a network of prisons in and around Hanoi. the Hilton, the Zoo, the Plantation, Brier Patch, Dog Patch, Alcatraz, and a dozen others. Each had a name given by the prisoners. None of the names were kind. Of the approximately 735 American military personnel held prisoner in Southeast Asia during the Vietnam War, 591 were returned alive during Operation Homecoming in 1973.
73 died in captivity. The rest remain unaccounted for. The men who survived endured an average of 5 to seven years of imprisonment. Some as long as 8 and 1/2 years, they were subjected to systematic torture, prolonged solitary confinement, starvation, and forced propaganda confessions, all in violation of the Third Geneva Convention, to which North Vietnam was a signatory.
This is the story of what happened inside the Hanoi Hilton. Not the sanitized version that exists in the museum that now occupies part of the old prison, but the version told by the men who were held there, who communicated through walls by tapping code, who resisted interrogation until their bodies broke, and who came home to a country that was not sure whether to call them heroes or simply to look away.
The men who became prisoners in North Vietnam arrived in captivity through a specific and violent process. They were military aviators flying combat missions over one of the most heavily defended airspaces in history. North Vietnam’s air defense system built with Soviet and Chinese assistants was a dense network of surfaceto-air missiles, anti-aircraft artillery, and radar guided weapons.
When an aircraft was hit, the pilot had seconds to eject. The ejection itself often caused injuries, broken bones, compressed vertebrae, dislocated shoulders. He then descended by parachute into hostile territory where he was typically captured within minutes by militia or soldiers. The initial capture was often violent. Pilots were beaten by civilians whose homes had been bombed.
The captured pilot was then transported to Hanoi, usually blindfolded, bound, and in the back of a truck. Upon arrival at Holo Prison, he entered a system designed not to hold him humanely, but to break him. The North Vietnamese had a specific objective, to extract military intelligence, to obtain propaganda confessions admitting to war crimes against the Vietnamese people, and to use the prisoners as political leverage.
Every prisoner who entered the Hanoi Hilton was subjected to this process. The system was deliberate, organized, and sustained over years. The prison itself was a cityb block-sized compound built by the French between 1886 and 1901. Its walls were 20 ft high, topped with electrified barbed wire and embedded broken glass.
Inside, the prisoners gave names to every section. Heartbreak Hotel for the initial interrogation cells, Little Vegas for a compound of buildings named after Las Vegas landmarks, and Camp Unity for the larger rooms where prisoners were eventually consolidated. Each name carried a specific meaning. Each carried a specific memory.
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That story may be the only record that exists. Now, back to the Hanoi Hilton. Every American prisoner who entered the Hanoi Hilton was subjected to the same initial process, interrogation. The North Vietnamese wanted two things: military information and propaganda. The military information was tactical. Targets, flight paths, squadron strength, carrier operations.
The propaganda was political. Written are recorded confessions admitting to crimes against the Vietnamese people that could be broadcast on Radio Hanoi or distributed to foreign journalists. The prisoners were trained to resist. Under the military code of conduct, American servicemen were required to provide only their name, rank, service number, and date of birth.
Beyond that, they were to resist to the utmost of their ability. The North Vietnamese understood this code. They had studied it and they had developed methods designed specifically to break it. The initial interrogation sessions followed a pattern. The prisoner would be placed in a small room, often alone, sometimes with a single interrogator.
He would be asked questions when he refused to answer beyond the required minimum. The questioning would intensify when the prisoner continued to resist. The process escalated to physical coercion. The most common methods were solitary confinement, sometimes lasting months or years, iron leg stocks that locked the prisoner’s ankles to a concrete slab, and a technique the prisoners called the rope trick.
In this method, the prisoner’s arms were bound behind his back and rotated upward by ropes until the shoulders dislocated from their sockets. The pain was so severe that men screamed until they lost consciousness. When they regained consciousness, the process resumed. The objective was not information.
By the time the rope trick was applied, the interrogators usually knew that the prisoner had nothing of tactical value to offer. The objective was the confession. The North Vietnamese needed the confession for their propaganda. And eventually almost every man broke. The breaking was not a failure. It was a mathematical certainty.
A human body subjected to sufficient pain over sufficient time will produce whatever sounds the torturer demands. The prisoners understood this. They developed a system. Resist until tortured beyond endurance. Then give as little as possible, recover and resist again. The Hanoi Hilton was the center of the North Vietnamese prison system for American PS. But it was not the only facility.
At least 13 prison camps operated in and around Hanoi during the war, each with distinct characteristics and purposes. The zoo, located southwest of Hanoi, was a former film studio converted into a prison compound where many prisoners were first housed after initial processing at Holo. Brier Patch, 35 mi west of the city, had no running water or electricity.
The plantation, a colonial estate near the city center, was used to house prisoners who might be shown to foreign delegations. Dog Patch in the mountains near the Chinese border was the most isolated camp. The prisoners were moved frequently between these facilities. Sometimes to disorient them, sometimes to separate leaders from their followers, and sometimes to prepare selected prisoners for propaganda appearances.
A prisoner might spend months in solitary at Holo, be transferred to the zoo for a year, moved to Brier Patch, returned to Holo, and then sent to Alcatraz, a maximum security facility reserved for the most resistant prisoners. Each transfer meant starting again. The guards themselves were a critical part of the system. The prisoners gave them nicknames: Bug, Rabbit, Cat, Rat, Spot, Mickey Mouse.
Some were relatively passive. Others were actively sadistic. The unpredictability was itself a form of control. Behavior that provoked no reaction one day could result in a severe beating the next. The prisoners learned to read the guards the way a sailor reads weather, watching for signs, anticipating changes, preparing for storms.
The daily routine, when there was no active interrogation, was defined by monotony and deprivation. The prisoners received two meals a day, typically a bowl of rice with boiled pumpkin or cabbage and sometimes a small piece of bread. The caloric intake was deliberately insufficient. Weight loss was dramatic and continuous.
Disease was constant, dysentery, intestinal parasites, skin infections, and the effects of untreated injuries sustained during ejection and capture. Medical care was minimal and often withheld as a form of leverage. The most extraordinary aspect of American captivity in North Vietnam was not the suffering. It was the resistance.
Isolated in cells, denied all contact with each other, forbidden to speak or communicate in any way. The prisoners built an invisible network that connected every man in the system and kept them alive. The foundation of this network was the tap code introduced by Air Force Captain Carile Smitty Harris, who had learned a version of it during survival training.
The tap code was a 5×5 matrix of the alphabet, five rows and five columns with the letter K omitted and replaced by C. To send a letter, a prisoner tapped first the row number, then the column number. Two taps, then three taps, the letter H. Four taps, then four taps, the letter T. It was slow. It was tedious.
It was the difference between sanity and madness. The prisoners tapped on walls, on floors, on water pipes. They swept the code with brooms against walls. They coughed it, sneezed it, and flashed it with hand signals when they caught glimpses of each other across courtyards. They communicated through the walls of their cells for hours each day, sharing names, sharing news from interrogation sessions, sharing jokes, sharing prayers, and sharing the orders of the senior ranking officer.
The senior ranking officer in the Hanoi Hilton was Commander James Bond Stockdale of the United States Navy. Stockdale was shot down on September 9th, 1965 and would spend 7 and 1/2 years in captivity, four of them in solitary confinement. He was the highest ranking naval officer captured during the war.
Through the tap code and a chain of command that operated entirely through prison walls, Stockdale organized resistance across the entire camp system. He established the back US policy, an acronym that defined the limits of resistance. Do not bow in public. Stay off the air. Do not accept early release which would violate the code of conduct’s principle of first in first out.
Do not make propaganda confessions. And never kiss the enemy goodbye. Never cooperate willingly. When the North Vietnamese identified Stockdale as the leader, they singled him out for the worst treatment. The Hanoi Hilton held men who would become some of the most prominent figures in American public life, though they did not know it at the time.
In their cells, they were simply prisoners. Their future significance existed only in their survival. Navy Lieutenant Commander John McCain was shot down on October 26th, 1967 during his 23rd bombing mission over Hanoi. He ejected from his A4 Skyhawk and landed in Truckbach Lake in the center of the city.
Breaking both arms and a leg, he was pulled from the water, beaten by a crowd, and taken to Holo Prison. He was refused medical treatment until the North Vietnamese discovered that his father was Admiral John S. McCain Jr., the commander of all US forces in the Pacific. They then offered him early release, a propaganda coup. McCain refused.
Under the code of conduct, prisoners were to be released in the order they were captured. First in, first out. McCain’s refusal earned him two additional years of solitary confinement and intensified abuse. He spent 5 and 1/2 years in captivity. Air Force Colonel Robinson Risner, one of the first senior officers captured, was held for 7 years and endured some of the most prolonged isolation of any prisoner.
Navy commander Jeremiah Denton, captured in 1965, became famous for blinking the word tur in Morse code during a televised propaganda interview. A message that was identified by American intelligence analysts and broadcast to the world. Air Force Colonel Bud Day, shot down in 1967, escaped from a camp in North Vietnam and walked for two weeks through the jungle towards South Vietnam before being recaptured just short of the border. He received the Medal of Honor.
These men were not exceptional because of their prominence. They were prominent because they survived. For every name that became famous, there were hundreds of men in the same cells enduring the same system whose names the public never learned. The year 1969 marked a turning point in the treatment of American prisoners in North Vietnam.
For the first five years of captivity from 1964 to 1969, the prisoners endured the worst period of systematic abuse. Torture was routine. Solitary confinement was the default. Communication between prisoners was punished severely. The North Vietnamese treated the prisoners not as prisoners of war, but as war criminals.
a distinction that in their interpretation placed the Americans outside the protections of the Geneva Convention. Two events changed this. The first was an escape attempt in May 1969 by Air Force captains John DSi and Edwin Adterbury from the zoo compound. They breached the walls and evaded capture for several hours before being caught.
The North Vietnamese retaliated with a campaign of severe punishment across all the camps, a period the prisoners called the purge. Every prisoner was interrogated. Many were tortured. Adterbury died in custody. The escape attempt had made things worse in the short term, but it had also demonstrated to the North Vietnamese that the prisoners remained capable of organized resistance.
The second event was the death of Ho Chi Min on September 2nd, 1969. Within weeks of his death, the treatment of prisoners began to improve. The routine torture stopped. Rations increased slightly. Some prisoners were allowed to share cells for the first time in years. The change was gradual, inconsistent, and incomplete.
But it was real. The prisoners attributed it partly to increased international pressure, partly to the shifting politics of the war, and partly to the practical realization by the North Vietnamese that the prisoners would eventually be returned and would tell the world what had been done to them. In late 1970, the North Vietnamese consolidated most of their prisoners into a large room at Holo Prison.
The prisoners named it Camp Unity. For the first time, men who had communicated for years only through tapped code on walls could see each other, speak to each other, and organize openly. Camp Unity was overcrowded, still austere, and still a prison. But it was the first time in years that these men were not alone. The Paris Peace Accords were signed on January 2007, 1973.
Among their provisions was the release of all American prisoners of war within 60 days. The prisoners learned of the agreement through their hidden radios and through the changed behavior of the guards, who suddenly became polite. The release began on February 12th, 1973. The prisoners were processed in groups, sorted by the order of their capture.
First in, first out. the principle that men like McCain had endured years of additional punishment to uphold. They were given new clothes. They were driven to Gam airport in Hanoi and they walked across the tarmac to waiting American Sea 141 Starlifter aircraft. The first man off the first plane at Clark Air Base in the Philippines was Navy Captain Jeremiah Denton.
He stepped to the microphone and said four words that the nation heard. We are honored to have had the opportunity to serve our country under difficult circumstances. It was the most restrained sentence ever spoken by a man who had been tortured for nearly 8 years. The crowd erupted. Denton had said what the prisoners had agreed to say.
Something measured, something that did not use the word torture, something that did not give their capttors the satisfaction of seeing them broken. Between February and March 1973, 591 American prisoners of war were returned. 325 Air Force, 138 Navy, 77 Army, 26 Marines, and 25 civilians. They arrived at Clark Air Base, were given medical examinations, debriefed by intelligence officers, allowed phone calls home, and then flown to military hospitals across the United States.
When they stepped off the planes on American soil, many of them kissed the ground. Many wept. Their families barely recognized them. Some had been gone for 8 years. Children who had been toddlers when their fathers left were now in grade school. Wives had aged. Parents had died. The country they returned to was not the country they had left.
It was a country that had turned against the war, that had protested in the streets, and that was not sure what to do with men who had served in a conflict. that America had decided to forget. The men who came home from Hanoi returned to a country divided by the war that had put them in prison. The anti-war movement had reshaped American politics.
The Ted offensive, the My Lime massacre, the Pentagon Papers, and the Watergate scandal had eroded public trust in the government and the military. The returning prisoners occupied an uncomfortable position. They were the only participants in the war that both sides of the political divide could agree to honor. The anti-war movement treated them as victims of a misguided policy.
The pro-war movement treated them as heroes who had upheld their duty. The prisoners themselves were simply men who wanted to go home. The physical recovery was measurable. Broken bones that had healed incorrectly were rebroken and reset. Damaged joints were repaired. Parasitic infections were treated.
Nutritional deficiencies were corrected. Weight was regained. The psychological recovery was harder to measure and harder to achieve. Many returnees experienced symptoms that would later be classified as post-traumatic stress disorder. Nightmares, hypervigilance, difficulty with enclosed spaces, emotional numbness, and an inability to discuss their experiences.
Others adapted with remarkable speed, returning to active military service, pursuing political careers, and building public lives. McCain became a senator and presidential candidate. Stockdale received the Medal of Honor and became a vice presidential candidate. Denton became a senator. Sam Johnson became a congressman.
These men channeled their captivity into public service, but they were the visible ones. Others returned to quiet lives, carried the prison with them in private, and never spoke of it again. The MIA controversy followed the returnees home. Of the approximately 2500 Americans listed as missing in action in Southeast Asia, the vast majority were dead.
But the possibility that some were still alive fueled a political movement that persisted for years. Of the approximately 735 American military personnel held prisoner in Southeast Asia during the Vietnam War, 591 were returned during Operation Homecoming in February and March 1973. They had been held for an average of 5 to seven years.
The longest held prisoner, Everett Alvarez, spent 8 years and 7 months in captivity. 73 American PS died in North Vietnamese custody. They were held in at least 13 different prisons. They resisted through a tap code on walls. They organized through a chain of command that operated through concrete barriers. They endured systematic violations of the Geneva Convention by a nation that had signed it.
The survivors came home to marriages that had survived and marriages that had not. They came home to children who had grown up without them. They came home to a country that was tired of the war and uncertain of how to receive the men who had fought it. Some built extraordinary public lives. Others lived quietly. All of them carried the Hanoi Hilton with them for the rest of their lives.
In their dreams, in their bodies, in the way they flinched at certain sounds, and in the silence they maintained about certain things they had endured. The Hanoi Hilton itself is mostly gone. In 1993, the Vietnamese government demolished the majority of the prison for commercial development. The gate house was preserved as a museum, the Hoalo prison relic.
The museum focuses primarily on Vietnamese political prisoners during the French era. The section on American prisoners is small and sanitized. Photographs of prisoners playing chess and celebrating Christmas. The real story, the cells, the ropes, the irontocks, the years of isolation is not told within those walls. What remains is not a war story.
It is a captivity story. And captivity does not end when the gate opens. It ends, if it ends at all, in the years after when the prisoner tries to become a person again in a world that moved on without them. The prison walls are down. The broken glass is gone from the top of the walls, but the men who were held inside them, the ones who survived carried the Hanoi Hilton with them for the rest of their lives. The tap code still works.
Two taps, then three. The letter H, four taps, pause, four taps. The letter T, it still spells the same word it always did. A word that was tapped through walls for 9 years by men who refused to be silenced. If this channel should continue documenting what happened to the prisoners of war, subscribe. Most of these men left no record, no diary, no memoir, no interview.
They came home and said nothing or they didn’t come home at all. We document the ones we can still find while the evidence remains.