Waterboarding produces an overwhelming, immediate sensation of drowning and suffocation, even when the person being subjected to it is in no actual danger of dying in that instant. It is formally described in forensic literature as a method designed to evoke the feeling of asphyxiation by drowning, achieved by pouring water over a cloth covering the nose and mouth of an immobilized person, typically while they are reclined or tilted head-down.1PubMed Central. An unusual suicide by self-waterboarding: forensic pathological issues The experience is not merely unpleasant or frightening in the way that, say, being dunked underwater might be. It triggers a cascade of reflexes and panic responses so primal and so powerful that virtually everyone who has undergone it, whether as a detainee or as a volunteer journalist, describes it as one of the worst things they have ever felt.
The Physical Sensation
The mechanics are deceptively simple. A person is restrained on their back, often on a board angled so the head is slightly lower than the feet. A cloth or cellophane is placed over the face, and water is poured steadily onto it. What the person experiences in the first seconds is not just “getting wet.” The water saturates the cloth and fills the nasal passages and mouth, creating an airtight seal. Breathing in draws water toward the trachea. The body instantly registers this as drowning, because in a real physiological sense, it is the beginning of drowning. The airway is obstructed by liquid, and the lungs cannot exchange air.
People who have undergone voluntary demonstrations consistently describe a feeling of the chest being crushed, even though nothing is pressing on it. The diaphragm contracts hard, trying to pull air in, but there is no air to pull. The resulting sensation is what respiratory physiologists call “air hunger,” a deeply distressing feeling that arises when the drive to breathe is high but the ability to ventilate is blocked.2PubMed Central. Air Hunger: A Primal Sensation and a Primary Element of Dyspnea Air hunger is not the same as simply holding your breath. When you hold your breath voluntarily, you remain in control and can inhale whenever you choose. Waterboarding removes that control entirely. The body is screaming for air, the person is trying to breathe, and every attempt to inhale only pulls more water toward the lungs. That combination of desperate need and total helplessness is what makes the experience so unbearable.
The gag reflex activates almost immediately. Many subjects report violent retching and involuntary swallowing of water. Some aspirate small amounts of water into the lungs, which can cause coughing fits that persist long after the cloth is removed. The sinuses burn. The eyes water. The entire experience, even when it lasts only ten or fifteen seconds, is described as feeling like minutes. Time distortion is one of the most commonly reported features.
Why the Body Reacts So Violently
The intensity of the reaction to waterboarding is not proportional to the actual amount of water involved or the objective danger in a controlled setting. It is proportional to the depth of the survival circuits being activated. The brainstem centers that govern breathing operate below conscious awareness and cannot be overridden by willpower. When those circuits detect that the airway is flooding, they launch a full-body alarm that includes spiking heart rate, a surge of stress hormones, and a panic response that feels completely involuntary.
Air hunger itself sits at the intersection of chemical and mechanical signaling. Carbon dioxide accumulating in the blood triggers chemoreceptors to demand ventilation, while the physical blockage of the airway prevents the lungs from expanding. This mismatch between the elevated drive to breathe and the mechanical inability to do so is the precise experimental paradigm researchers use to produce the most intense air hunger in laboratory settings.3PubMed Central. Air Hunger: A Primal Sensation and a Primary Element of Dyspnea Waterboarding replicates that paradigm almost perfectly, but in a far more violent and chaotic way than any lab protocol.
The head-down tilt adds another layer. With the feet elevated above the head, water flows more readily into the sinuses and toward the back of the throat by gravity. The position also creates a feeling of disorientation and helplessness that compounds the respiratory distress. Some accounts describe the sensation as being held underwater while strapped to something, even though the person is technically above the surface. The brain, receiving signals of liquid flooding the airway and an inability to right itself, constructs an experience indistinguishable from drowning.
What Voluntary Subjects Have Reported
Several journalists and public figures have undergone waterboarding voluntarily to understand what it involves. Their accounts are remarkably consistent with one another, which is itself telling. The most widely known is that of the late journalist Christopher Hitchens, who was waterboarded for a 2008 magazine piece. He lasted a few seconds before invoking the pre-arranged signal to stop, and afterward declared without reservation that it constitutes torture. He described the sensation as being unable to determine whether he was breathing in or out, combined with a terror so complete that rational thought vanished instantly.
Other journalists and former military personnel who have tried it in controlled settings describe the same thing: an immediate loss of composure, an inability to resist panic, and a lingering sense of dread that persisted for hours or days afterward. Several reported that they went in expecting to tough it out and were stunned by how quickly and totally the experience overwhelmed them. A common refrain is that nothing about understanding the procedure intellectually prepares you for what it actually feels like. Knowing that you are safe, that someone will stop on your signal, does not diminish the terror, because the terror is not coming from a cognitive assessment of danger. It is coming from brainstem reflexes that do not consult your opinions.
Military trainees in certain survival, evasion, resistance, and escape (SERE) programs have also been exposed to waterboarding as part of their training to resist interrogation. Reports from participants in those programs echo the journalist accounts, with the added detail that many trainees who underwent it once refused to repeat the experience, even knowing it would end quickly and safely.
The Psychological Experience During the Act
Beyond the physical distress, waterboarding produces an acute psychological state that people struggle to articulate. The most common description is a feeling of dying. Not a fear of dying, but the felt experience of death arriving, of the body shutting down. Some subjects describe a sense of the world narrowing to a single point of suffocating panic. Others describe dissociation, a feeling of leaving their own body, which trauma researchers recognize as a protective response when pain or terror exceeds what the conscious mind can process.
The loss of control is a critical element. Being restrained, unable to turn your head, unable to sit up, unable to cough effectively, while water continues to pour, eliminates every instinctive escape behavior. Humans and other mammals have deeply wired responses to airway obstruction that involve thrashing, turning, and fleeing. When all of those are blocked, the remaining experience is pure helpless terror. This is not incidental to the technique. It is the entire point.
In an interrogation context, the psychological impact is compounded by uncertainty. A person being waterboarded by captors does not know when it will stop, whether it will escalate, or whether this is the time the water actually kills them. That uncertainty transforms each application from a discrete event into an ongoing existential threat. Even between sessions, the anticipation of the next one produces extreme anxiety, insomnia, and hypervigilance.
Long-Term Psychological Damage
The effects of waterboarding do not end when the water stops. Research on survivors of torture, including waterboarding, shows lasting changes in how the brain processes fear. A study examining survivors of organized violence who had been exposed to methods including waterboarding found that their brains developed an enlarged fear network with a lowered activation threshold, meaning that stimuli that would not alarm a healthy person triggered strong fear responses in survivors.4Zeitschrift für Psychologie. The Tortured Brain This was measured using brain imaging, and it correlated with prominent post-traumatic stress disorder symptoms.
The finding is especially striking because the study compared torture survivors to control subjects from similar ethnic backgrounds who had experienced hardship but not torture. The enlarged fear network was specific to the torture experience, not simply a product of living through conflict or displacement. Waterboarding, electric shock, and simulated execution all produced similar downstream effects on brain function, despite being physically very different experiences. What they share is the activation of extreme bodily distress, terror, and helplessness at the same time, and it is that combination that appears to rewire the brain’s threat-detection system.5Zeitschrift für Psychologie. The Tortured Brain
PTSD symptoms in waterboarding survivors include flashbacks triggered by water, rain, or even the sound of running faucets. Showering can become an ordeal. Lying on one’s back may provoke panic. The specific sensory details of the experience become encoded as trauma cues, and the brain treats encounters with those cues as genuine threats for years or decades afterward.
Physical Risks and Complications
Although waterboarding is sometimes described as a technique that leaves “no marks,” it carries real physical risks. Aspiration of water into the lungs can cause aspiration pneumonia, a potentially fatal infection. Repeated sessions can cause cumulative lung damage. The violent coughing and retching that accompany the procedure can result in vomiting, which in a restrained, head-down position creates a serious aspiration hazard of its own. Broken ribs from struggling against restraints have been reported. Oxygen deprivation, even brief, can cause brain injury if repeated.
There are documented cases of death during waterboarding, both in historical records and in modern contexts. The forensic case report that defines waterboarding as evoking the sensation of asphyxiation by drowning was itself prompted by a death, underscoring that the line between simulating drowning and actually drowning is thinner than proponents of the technique have acknowledged.6PubMed Central. An unusual suicide by self-waterboarding: forensic pathological issues Dry drowning, in which a small amount of aspirated water triggers laryngospasm and fatal airway closure, is a recognized medical phenomenon that makes any controlled-drowning scenario inherently dangerous.
Six Hundred Years of Recognition as Severe Torture
One of the more revealing aspects of the waterboarding debate is how recent the idea is that it might not be torture. Historical analysis tracing the technique back over six centuries found that, before the early 2000s, waterboarding was unequivocally classified not just as torture but as severe torture, across legal systems, military codes, and cultural norms spanning multiple continents.7International Relations. Historicizing waterboarding as a severe torture norm The earliest explicit written description of the technique dates to 1384, and throughout its documented history, it was understood to be among the most extreme things one person could do to another.
The reclassification of waterboarding as a “enhanced interrogation technique” rather than torture during the post-2001 period represents what historians have called a radical inversion of a norm that had been stable for more than 600 years.8International Relations. Historicizing waterboarding as a severe torture norm This rebranding did not emerge from new evidence about what waterboarding feels like or does to a person. It was a legal and political strategy designed to permit the use of a technique that every prior generation recognized as crossing the line. Spanish Inquisitors used waterboarding. Japanese soldiers were prosecuted as war criminals by the United States for using it on American prisoners during World War II. The idea that it is somehow ambiguous in severity is a product of 21st-century political framing, not of any genuine uncertainty about the experience.
Why “It’s Not That Bad” Claims Persist
Despite the consistency of first-person accounts, the clarity of the historical record, and the physiological evidence, some people continue to argue that waterboarding is not really torture, or that it falls into a gray area between harsh treatment and genuine abuse. This argument tends to rest on a few recurring claims, none of which hold up well under scrutiny.
The first is that waterboarding does not cause lasting physical injury. This is sometimes true in a narrow sense, though as discussed, aspiration, lung damage, and even death are documented risks. But the argument also reveals a misunderstanding of what torture is. International legal definitions of torture center on severe pain or suffering, whether physical or mental. The psychological suffering produced by waterboarding is extreme by any measure, and the long-term brain changes documented in survivors confirm that the harm is not momentary.
The second claim is that SERE trainees undergo waterboarding and emerge fine, so it cannot be that bad. This ignores critical differences in context. SERE trainees know the experience will be brief, controlled, and administered by allies. They have a safe word. They are not sleep-deprived, starved, or isolated. They are undergoing a known training exercise with a defined endpoint. Detainees subjected to waterboarding have none of these protections. They do not know when it will stop. They have reason to believe it might kill them. Context transforms an already terrible experience into something qualitatively different.
The third is a purely semantic argument that because the person does not actually drown, the technique is a form of pressure rather than genuine harm. This is a bit like arguing that holding a loaded gun to someone’s head and pulling the trigger on an empty chamber is not threatening because the bullet was not there. The body does not know the difference. The nervous system responds to the stimulus it receives, and the stimulus it receives during waterboarding is indistinguishable from drowning. The fact that death does not follow does not undo what the brain and body experienced.
How Waterboarding Compares to Other Forms of Distress
People sometimes ask how waterboarding ranks relative to other painful or frightening experiences. The question is inherently difficult to answer because pain and terror are subjective, but a few observations stand out. Unlike many forms of physical torture that involve escalating pain over time, waterboarding reaches maximum intensity almost instantly. There is no ramping up. Within seconds, the person is at the peak of what their nervous system can produce in terms of alarm. This rapidity is part of why it is so disorienting. People who have experienced both severe pain from injury and waterboarding tend to describe them as different categories of suffering: pain is awful but comprehensible, while waterboarding feels like an encounter with annihilation.
The research on torture survivors found that methods as physically different as waterboarding, electric shock, and mock execution produced remarkably similar patterns of long-term brain change, suggesting that what matters most for psychological damage is not the specific physical modality but the combination of extreme distress, helplessness, and perceived mortal threat.9Zeitschrift für Psychologie. The Tortured Brain Waterboarding delivers all three simultaneously and with extraordinary efficiency, which may be why it has been singled out across centuries as a particularly cruel method.
The Question of Whether It “Works”
A frequent follow-up question is whether waterboarding at least produces reliable intelligence, as if effectiveness might offer a pragmatic justification. The neuroscience of extreme stress suggests it does not. When the brain is flooded with the kind of panic waterboarding produces, higher cognitive functions, including accurate memory recall and coherent narrative construction, degrade. A person in that state will say anything to make it stop, which is not the same as providing accurate information. The distinction between compliance and reliability is central to interrogation science, and extreme coercion tends to maximize the former while undermining the latter.10QJM. The captive brain: torture and the neuroscience of humane interrogation
Professional interrogators with experience in both coercive and rapport-based approaches have repeatedly stated in public testimony and published interviews that relationship-based techniques produce better intelligence. The person being questioned needs to be able to think clearly, access specific memories, and distinguish between what they know and what they are guessing. A brain in survival mode cannot do any of those things well. The experience of waterboarding does not sharpen the mind. It collapses it into a single imperative: make this stop, by any means, true or false.
This gap between the perceived utility of torture and its actual effectiveness is well-documented enough that the question of whether waterboarding “works” has largely been settled among researchers who study interrogation. The persistence of the idea that it does reflects the intuitive but incorrect assumption that more suffering equals more truth, an assumption that the neuroscience of stress and memory consistently contradicts.