Film

S21: The Khmer Rouge Killing Machine

Rithy Panh returns to Tuol Sleng, the Phnom Penh school turned torture centre known as S21, and puts survivors in the same room as the guards who ran it. There's no narration or reenactment trickery — just testimony, walked-through corridors, and men demonstrating, almost automatically, exactly what they did there. Quiet, procedural, and devastating.

TMDb rating7.5

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The Act of Killing2012

Death squad leaders in Indonesia reenact their own massacres for the camera, revealing something monstrous about denial and pride rather than remorse — the same unblinking confrontation with perpetrators that makes S21 so unbearable and necessary.

But The showbiz reenactments can feel queasy rather than illuminating, and some viewers find its stylised approach to atrocity distasteful.

The Act of Killing poster

The Look of Silence2014

Joshua Oppenheimer's quieter companion piece, where a man confronts his brother's killers directly — the same steady, unbearable patience with perpetrators who still won't admit wrongdoing decades later.

But Even slower and more restrained than its predecessor; the tension is entirely internal and some will find it airless.

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Shoah1985

Claude Lanzmann's nine-hour epic of testimony from Holocaust survivors, bystanders, and perpetrators, filmed decades later at the sites themselves — the origin point for the kind of patient witness-work S21 practises.

But Nine hours is a genuine commitment, and its refusal of archive footage or music makes for a demanding, austere watch.

Shoah poster

The wildcard

Something you would not have found on your own.

The Lives of Others2006

Both study a state's ordinary machinery of surveillance and betrayal through the people who ran it — East Germany's Stasi here, Democratic Kampuchea's prison staff there — and ask what happens to a person who's spent years operating that machine.

A Stasi agent tasked with spying on a writer slowly, quietly unravels — a fictional thriller that gets at the same bureaucratic evil S21 documents, just with a plot and an ending.

But It's a polished, emotionally satisfying drama, and that satisfaction is precisely what S21 refuses to offer you.

The Lives of Others poster
More like this (8)

The Killing Fields1984

A dramatized account of a journalist and his translator surviving the Khmer Rouge years, giving the historical scaffolding — the war, the ideology, the collapse — that S21 simply assumes you already have.

But It's a conventional prestige drama with a white-saviour framing that now feels dated next to Cambodian-made accounts.

The Killing Fields poster

The Fog of War2003

Errol Morris interviews Robert McNamara about orchestrating the Vietnam War, and the old man's mix of pride, evasion, and genuine anguish is eerily close to the guards' testimony in S21.

But McNamara is a far more polished, self-aware subject than the S21 guards, so the moral discomfort lands differently — more debate than horror.

The Fog of War poster

Enemies of the People2009no page yet

A Cambodian journalist spends a decade gently interviewing former Khmer Rouge killers, including the architects above the S21 guards — a direct, essential follow-up to the questions this film raises.

But Its slow, patient approach and lo-fi production values ask a lot of viewers used to slicker documentary conventions.

Hotel Rwanda2004

A dramatized true story of a hotel manager sheltering refugees during the Rwandan genocide, proof that mass killing organized through ordinary bureaucratic means recurs, and can still be filmed for a wide audience without losing its horror.

But Its Hollywood polish and clear hero narrative sit far from S21's refusal to give anyone that kind of comfort.

Hotel Rwanda poster

Waltz with Bashir2008

An animated memoir of the Lebanon War and the Sabra and Shatila massacre, using rotoscoped dream logic to approach memory the way S21 approaches confession — sideways, and never fully.

But The animation style is genuinely beautiful, which some feel is an odd, even uncomfortable, register for this material.

Waltz with Bashir poster

Schindler's List1993

The most famous dramatization of the Holocaust there is, still worth revisiting for how it renders bureaucratic evil through one man's slow moral awakening — a very different route to the same subject.

But Its emotional crescendos and eventual uplift are exactly the kind of narrative shaping S21 refuses to offer.

Schindler's List poster

The Missing Picture2013

Made by the same director, Rithy Panh, this is his own memoir of surviving the Khmer Rouge, told because no film footage of his family's suffering exists — so he recreates it by hand instead.

A wholly different way of doing what S21 does: instead of testimony from other people, this is the director's own loss, staged with painted clay figurines standing in for family he lost, and it's unexpectedly overwhelming.

But The clay-figure device sounds twee described on paper, and it takes several minutes to stop noticing the artifice and start feeling it.

The Missing Picture poster

Night and Fog1956

This 1956 French short essentially invented the move S21 makes decades later — walking, camera in hand, through the physical remains of an atrocity, letting empty rooms do the work testimony can't.

Alain Resnais's 32-minute film pairs colour footage of empty concentration camps with black-and-white archival horror, and its restrained, poetic narration became the template for nearly every atrocity documentary since, including this one.

But Its brevity and mid-century style can feel almost too composed, too literary, for viewers expecting the rawer approach of more recent films.

Night and Fog poster

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Recommended by

The Act of Killing, The Missing Picture, The Look of Silence, Shoah