What happens to you in the quietest room on Earth?

In short: According to Guinness World Records, the quietest place on Earth is the anechoic test chamber at Orfield Laboratories in Minneapolis, measured at −24.9 dBA on 19 November 2021. In a room this quiet, you do not hear “nothing”: you begin to hear yourself — your heartbeat, your breathing and often a faint ringing generated by your own ears and brain. No study has tested an anechoic chamber as a recovery tool, although short, comfortable periods of silence do appear calming. A float offers a gentler version of the idea: a dark, quiet private room and warm water that effortlessly holds you, for 60 or 90 minutes.

Part of the Ōmni Recovery Library · Recovery by the Senses

Maybe your days have a soundtrack you barely notice anymore: motorbike horns, a neighbour’s karaoke, the steady hum of an air conditioner. Then, every so often, you catch yourself wishing it would all simply stop. What would real silence actually feel like? Engineers have built rooms that come remarkably close, and what people notice inside them is surprisingly intimate. Here is what the record numbers really mean, what happens to body and mind when almost all outside sound disappears, what science can and cannot tell us, and how to find a gentler kind of quiet in Saigon.

Ōmni Evidence Scale: No good evidence yet, for an anechoic chamber as a recovery tool (nobody has tested it). Early evidence, for short silences calming the body (small lab studies). Strong evidence, for float and stress. See how we rate evidence on the Ōmni Evidence Scale.

What is an anechoic chamber?

“Anechoic” simply means “without echo”. An anechoic chamber is designed so that sound does not bounce back from the walls, floor or ceiling. Every surface is covered with deep wedges of sound-absorbing material, usually fibreglass or foam, pointing into the room like the teeth of a giant comb. Instead of reflecting around the space, sound waves enter those wedges and are absorbed. The room often sits inside a second heavy shell, sometimes mounted on springs, so traffic, footsteps and lift motors stay outside too.

These rooms were never designed for wellness. Companies and universities use them to hear and measure products with extraordinary precision, from hearing aids to motorbikes and washing machines. The profound quiet is really a side effect of very clever engineering.

The record: how quiet is the quietest room on Earth?

Guinness World Records lists the anechoic test chamber at Orfield Laboratories in Minneapolis, Minnesota, as the quietest place on Earth, with a background level of −24.9 dBA measured on 19 November 2021. It was so quiet that a single microphone could not measure it directly: the microphone’s own electrical noise was louder than the room. The team therefore cross-correlated two Brüel & Kjær type 4145 microphones to tease the chamber’s level out from beneath the instruments’ own noise.

The title has changed hands over the years. According to Guinness, Orfield’s room first set the record in 2004 at −9.4 dBA and improved it to about −13 dBA in 2012 (Orfield gives −13.4 dB). In 2015, an anechoic chamber in Building 87 at Microsoft’s headquarters in Redmond, Washington, took the record at −20.35 dBA. In 2021, Orfield reclaimed it with −24.9 dBA and has held it since. Guinness describes the Orfield room as stopping 99.99% of sound, using fibreglass wedges about 1 metre (3.3 feet) deep, double walls of insulated steel and around 30 cm (a foot) of concrete.

What does a negative decibel mean?

Zero decibels does not mean “no sound”. It is a reference level close to the faintest sound a healthy young ear can detect, which means a room can genuinely measure quieter than zero. The World Health Organization’s guideline for a sleeping room is about 30 dBA. Every 10 dB represents ten times the sound energy, so the Orfield chamber contains hundreds of thousands of times less sound energy than that quiet bedroom. At that point, the most noticeable source of sound in the room is often you.

What happens to you inside: “you become the sound”

When the outside world becomes quiet enough, your hearing seems to turn up its sensitivity, rather like your eyes adjusting to a dark room. In the Orfield chamber, visitors have described hearing blood moving through their veins and even the movement of their eyelids when they blink. Founder Steven Orfield told Guinness that in a quiet room you hear your heartbeat, sometimes your lungs and your stomach. His wonderfully concise summary was: “In the anechoic chamber, you become the sound.” After about 30 minutes inside, he could even hear the mechanical valve in his own heart working, loudly.

Composer John Cage encountered the same basic revelation in 1951, inside an anechoic chamber at Harvard University. He entered looking for silence and, as he later wrote, heard “two sounds, one high and one low”. The engineer told him the high one was his nervous system and the low one his blood circulating. That explanation is doubtful, since you cannot hear nerves firing; the high tone was probably the faint ringing many ears produce in silence (more on that below). But Cage’s larger conclusion endured: for a living person, absolute silence may be impossible to experience. The encounter helped shape 4′33″, his piece in which the performer plays nothing and the audience instead hears the room itself.

The experience also varies from person to person. Some visitors become unusually aware of internal sounds and sensations, while others describe the chamber as one of the calmest places they have ever been. What is consistent is that when almost everything outside you disappears, the normally quiet details inside you become much easier to notice.

The “nobody lasts 45 minutes” story

You may have seen the claim that nobody can stay in the quietest room on Earth for more than 45 minutes. That number spread through 2012 news stories after a challenge in which people sat inside the chamber in darkness and one person stayed for 45 minutes. It was never an official endurance record or a medical limit: Guinness measures the room, not the people inside it. A VICE journalist later stayed 48 minutes in the Danish chamber pictured above, and Orfield Laboratories now books “silent sessions” by appointment.

What science says about very deep silence

Nobody has run a trial testing anechoic chambers for stress or recovery. What researchers have studied instead is what happens to perception when sensory input falls dramatically, and what shorter periods of silence appear to do to the body.

• Silence makes ears “hear” sounds. In a classic 1953 study, Heller and Bergman placed 80 adults with normal hearing in a soundproof booth, and the large majority reported buzzing, ringing or humming despite no external source being present. In 2008, an Italian-led team placed 53 young adults in an anechoic chamber for four minutes: 83% heard at least one sound, and adding a switched-off loudspeaker raised that only to 92%, suggesting that expectation played a relatively minor role. In deep silence, the auditory system becomes remarkably good at revealing its own background activity.
• Remove sight as well, and perception gets creative. In a 2009 study, Mason and Brady placed volunteers in a brief period of complete isolation from sound and light. Both groups reported more unusual perceptions than outside it, with the strongest effects among people already more prone to hallucinations. It belongs to the same broader family of perceptual effects explored in long darkness retreats.
• Short pauses calm the body. In a 2006 study in the journal Heart, 24 people listened to different styles of music with a random two-minute pause. During that pause, heart rate, blood pressure and breathing fell, even below their starting level. It is a small study, but it supports a pleasantly simple idea: sometimes a break in the input is restful in itself.
• Mice grew new brain cells in silence. In a 2015 study, mice given two hours of silence a day had more new neurons in the hippocampus a week later than mice exposed to other sounds. Interesting, certainly, but still a clue rather than evidence for humans.

Taken together, the picture is fairly clear at one level and still open at another: deep silence changes what we perceive, while short, comfortable periods of quiet appear calming. Whether the world’s quietest room itself helps recovery remains unknown.

The risks, briefly

For a healthy visitor, a supervised half hour in an anechoic chamber is considered low risk. The most noticeable effects tend to be heightened awareness of internal sounds and body sensations, which settle again once ordinary sensory input returns. People prone to hallucinations may experience stronger perceptual effects during deep isolation. Visits to rooms such as Orfield’s are arranged by appointment, with staff nearby, and you can leave whenever you choose.

Float: a kinder kind of quiet

A float room is not an anechoic chamber — and for rest, that is part of the appeal. It is quiet enough for the outside world to recede, while warmth, water and soft darkness give your nervous system something gentle to settle into. You lie back in about 25 cm of water holding around 500 kg of dense, mineral-rich Epsom salt, warmed to 33–34 °C, close to skin temperature. The water supports your body, so the muscles normally working to hold you upright can soften. With earplugs in and the lights off, your breath and heartbeat may become easier to notice, much as Cage discovered in silence, but within an environment designed from the beginning for rest.

	Anechoic chamber	Float room
Built for	Measuring products and hearing	Rest
Sound	Below 0 dBA in record-holding rooms; no echoes at all	Quiet, with earplugs; you can still hear your breath
Your body	Standing or sitting on a mesh floor	Resting in warm, buoyant water
Light	Usually on; some visits in darkness	You choose: soft light or complete darkness
Typical feeling	Extreme sensory quiet and heightened awareness	Deep relaxation, with a calm, dreamy quality
Evidence for recovery	No good evidence yet	Strong evidence, for stress

Float has been explored across hundreds of scientific studies. A 2005 meta-analysis of 27 flotation REST studies found positive effects on stress-related body measures and well-being, while a Swedish randomised pilot trial found that 65 working adults who floated 12 times over seven weeks reported less stress and anxiety and better sleep than a waiting group. At the Laureate Institute for Brain Research in the US, 50 people living with anxiety or stress-related conditions felt markedly less anxious after a single one-hour float, in a study without a control group. Curious about what may be happening on the brain side? Read what happens to your brainwaves in a float tank, or Float Vietnam’s What Is Sensory Deprivation?

Ōmni Evidence Scale: Strong evidence, for float and stress. We rate it Strong because, alongside these trials, user experience is overwhelmingly positive: in a 2025 survey of regular floaters, 92% reported relaxation and 77% less stress, echoed by thousands of reviews, Reddit threads and forums, and by athletes and public figures who float.

What we think at Ōmni (and, yes, what we sell)

We are a float centre, so you should absolutely weigh this part accordingly. But we love the anechoic-chamber story because it reveals something simple and surprisingly beautiful: when the outside world becomes quiet, you start noticing what was already there. For everyday life in a loud city, though, we prefer a quiet that holds you rather than one designed to test equipment. Ōmni Space in Thảo Điền comes from the team behind Float Vietnam, the country’s pioneer float centre since 2017. Each float room is private, with its own shower; you lock the door from the inside, choose the light yourself, and we provide earplugs and towels. A single float costs 1,500,000 VND for 60 minutes or 2,000,000 VND for 90 minutes; the couple room, one large square pool for two, adds 700,000 VND for the second person. Want to explore the idea of quiet a little further? Read why silence is the new necessity of modern life. New to floating? Start with what float therapy is.

Ōmni Space – Float Saigon is at 16C Quốc Hương, Thảo Điền. We are open 9:00–21:00 daily; the last float starts at 20:00, and walk-ins are welcome until 18:00.

Float PlanRunning on empty?Take the one-minute Float Plan quiz: tell us how you feel and what you need, and get a simple plan for your first session.Make my Float Plan

FAQ

Where is the quietest room on Earth?

Guinness World Records lists the anechoic test chamber at Orfield Laboratories in Minneapolis, USA, measured at −24.9 dBA on 19 November 2021. Microsoft’s chamber in Redmond previously held the record from 2015 with −20.35 dBA.

What do you hear in an anechoic chamber?

Mostly yourself: your heartbeat, breathing, stomach and even the movement of your eyelids. Many people also notice a faint ringing generated by the ear and brain when external sound becomes extremely quiet.

Is it true nobody can stay longer than 45 minutes?

No. The claim grew from 2012 news stories about one person who stayed for 45 minutes during a challenge. It is neither an official endurance record nor a medical limit.

Is total silence good for you?

Short, comfortable pauses do appear calming: in one small study, two minutes of silence lowered heart rate and blood pressure. Very deep silence changes perception in unusual ways, but nobody has tested an anechoic chamber itself as a recovery tool.

How is a float room different from an anechoic chamber?

It is designed for rest: quiet, dark if you choose, with your body supported by warm, buoyant salt water for 60 or 90 minutes. Float has strong evidence for stress.

Written by the team at Ōmni Space – Float Saigon in Thảo Điền, Vietnam’s pioneer float centre since 2017. We sell floats, not anechoic chamber visits. General information, not medical advice; sources checked on 30 October 2026.

Sources

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2. Newman V, Guinness World Records (27 August 2024). Inside quietest place on Earth where you can hear your blood pumping and eyes blinking.
3. Orfield Laboratories. Anechoic chamber (checked 30 October 2026).
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