Human bodies work best at sea level. Down here, oxygen levels are adequate for our brains and lungs. At much higher altitudes, our bodies cannot function properly.
But if climbers want to summit Mount Everest, the tallest peak in the world at 29,029 feet (8,848 meters or 5.5 miles) above sea level, they have to brave what’s known as the “death zone.” This is the area with an altitude above 8,000 meters, where there is so little oxygen that the body starts to die, minute by minute and cell by cell.
In the death zone, climbers’ brains and lungs are starved for oxygen, their risk of heart attack and stroke is increased, and their judgment quickly becomes impaired.
“Your body is breaking down and essentially dying,” Shaunna Burke, a climber who summited Everest in 2005, told Business Insider. “It becomes a race against the clock.”
This month, at least 11 people died on Everest, almost all of whom spent time in the death zone.
Some expedition companies blamed these deaths on crowding, noting that the peak became so choked with climbers during a rare period of good weather that people were stuck in the death zone for too long. On May 22, 250 climbers attempted to reach the summit, The Kathmandu Post reported, and many climbers had to wait in line to go up and down.
These extra, unplanned hours in the death zone might have put the 11 people who perished at higher risk, though it’s hard to determine the specific causes of each death.
One mountaineer said climbing Everest feels like ‘running on a treadmill and breathing through a straw’
At sea level, the air contains about 21% oxygen. But at altitudes above 12,000 feet, oxygen levels are 40% lower.
Jeremy Windsor, a doctor who climbed Everest in 2007 as part of the Caudwell Xtreme Everest Expedition, told Everest blogger Mark Horrell that blood samples taken from four mountaineers in the death zone revealed that the climbers were surviving on just one-quarter of the oxygen they needed at sea level.
“These were comparable to figures found in patients on the verge of death,” Windsor said.
Five miles above sea level, the air has so little oxygen in it that even with supplementary air tanks, it can feel like “running on a treadmill and breathing through a straw,” according to mountaineer and filmmaker David Breashears.
Climbers need to acclimate to the lack of oxygen
A lack of oxygen results in myriad health risks. When the amount of oxygen in your blood falls below a certain level, your heart rate soars to up to 140 beats per minute, increasing your risk of a heart attack.
Climbers have to give their bodies time to acclimate to the lung-crushing conditions in the Himalayas before attempting to summit Everest. Expeditions generally make at least three trips up the mountain from Everest Base Camp (which is higher than nearly every mountain in Europe at 17,600 feet), going a few thousand feet higher with each successive trip before making a push for the top.
Over the course of those weeks at high altitudes, the body starts to make more hemoglobin (the protein in red blood cells that helps carry oxygen from the lungs to the rest of the body) in order to compensate. But too much hemoglobin can thicken your blood, making it harder for the heart to pump blood around the body. That can lead to a stroke or the accumulation of fluid in your lungs.
On Everest, a condition called high altitude pulmonary edema (HAPE) is common — a quick stethoscope check can reveal a clicking sound as fluid that’s leaked into the lungs rattles around. Other symptoms include fatigue, a feeling of impending suffocation at night, weakness, and a persistent cough that brings up white, watery, or frothy fluid. Sometimes the coughing is so severe that it can crack or separate ribs.
Climbers with HAPE are always short of breath, even when resting.
In the death zone, your brain can start to swell, which can lead to nausea and a form of psychosis
Acclimatization to death-zone altitudes simply isn’t possible, high-altitude expert and doctor Peter Hackett told PBS.
One of the biggest risk factors at 26,000 feet is hypoxia, a lack of adequate oxygen circulation to organs like your brain. If the brain doesn’t get enough oxygen, it can start to swell, causing a condition called high altitude cerebral edema (HACE). Essentially, it’s HAPE for the brain.
This swelling can trigger nausea, vomiting, and difficulty thinking and reasoning.
An oxygen-starved brain can cause climbers to forget where they are and enter a delirium that some experts consider a form of high-altitude psychosis. Hypoxic climbers’ judgment becomes impaired, and they’ve been known to do strange things like start shedding their clothes or talking to imaginary friends.
Other possible dangers include insomnia, snow blindness, and vomiting
Burke said that while climbing, she suffered from a constant, relentless cough.
“Every second or third breath your body gasps for air, and you wake yourself up,” she said.
The air was so thin that she was unable to sleep properly.
“Humans will start to deteriorate,” Hackett added. “Sleeping becomes a problem. Muscle wasting takes place. Weight loss takes place.”
Nausea and vomiting from altitude-related illnesses, including HAPE and HACE, also cause a decrease in appetite. The glare from the endless snow and ice can cause snow blindness — temporary vision loss, or burst blood vessels in your eyes.
Temperatures in the death zone never rise above zero degrees Fahrenheit. “Any exposed skin freezes instantly,” Burke said.
A loss of blood circulation to climbers’ fingers and toes can cause frostbite, and in severe cases — if the skin and underlying tissues die — gangrene. Gangrenous tissue often needs to be amputated.
All this physical weakening and impaired vision can lead to accidental falls. Fatigue is ever-present, according to Burke.
“It takes everything to put one foot in front of the other,” she said.
Poor decision-making can also lead climbers to forget to clip back into a safety rope, stray from the route, or fail to properly prepare life-saving equipment like oxygen tanks.
Mountaineers climb through the death zone in a day, but they can wind up waiting in line for hours
Climbing in the death zone is “a living hell,” as Everest climber and 1998 NOVA expedition member David Carter told PBS.
Typically, climbers attempting to bag the summit try and make it up and down in a single day, spending as little time as possible in the death zone before returning to safer altitudes. But this frenzied push to the finish line comes at the end of weeks of climbing.
Lhakpa Sherpa, who’s reached Everest’s summit nine times (more than any other woman on Earth) previously told Business Insider that the day a group attempts to summit Everest is by far the most difficult period of the trek.
In order to summit successfully, everything must go right. Around 10 p.m., climbers leave Camp Four at 26,000 feet. The first chunk of their climb is done in the dark, lit by starlight and headlamps.
About seven hours later climbers typically reach the summit. After a brief rest filled with celebrations and photographs, the expeditions turn around, making the 12-hour trek back to safety and arriving (ideally) before nightfall.
Human bodies cannot function properly above a certain altitude. We work best at sea level, where oxygen levels are adequate for our brains and lungs.
But if climbers want to summit Mount Everest, the tallest peak in the world at 29,029 feet (8,848 meters or 5.5 miles) above sea level, they have to brave what’s known as “The Death Zone” – the altitude above 8,000 meters where there is so little oxygen that the body starts to die, minute by minute and cell by cell.
Recent overcrowding on Everest has resulted in the deaths of at least 11 people this past week. In the Death Zone, climbers’ brains and lungs are starved for oxygen, their risk of heart attack and stroke is increased, and their judgment quickly becomes impaired.
There is a dangerous lack of oxygen at the top of Mount Everest. One mountaineer says it feels like ‘running on a treadmill and breathing through a straw’
At sea level, the air contains about 21 percent oxygen. But when humans reach altitudes above 12,000 feet – where oxygen levels are 40 percent lower – it takes a huge toll on our bodies.
Jeremy Windsor, a doctor who climbed Everest in 2007 as part of the Caudwell Xtreme Everest Expedition, told Everest blogger Mark Horrell that blood samples taken from four mountaineers in the Death Zone revealed that the climbers were surviving on just one-quarter of the oxygen they needed at sea level.
“These were comparable to figures found in patients on the verge of death,” Windsor said.
Five miles above sea level the air has so little oxygen in it that even with supplementary air tanks, it can feel like “running on a treadmill and breathing through a straw,” according to US mountaineer and filmmaker David Breashears.
Climbers need to acclimate themselves to the lack of oxygen, but doing so can put people at risk for a stroke or heart attack
This lack of oxygen tends to result in myriad health risks. When the amount of oxygen in your blood falls below a certain level, your heart rate soars to up to 140 beats per minute, increasing your risk of a heart attack.
Climbers have to give their bodies time to acclimate to the lung-crushing conditions in the Himalayas before attempting to summit Everest.
A deadly traffic jam on Mount Everest’s ‘death zone.’ (Twitter/@nimsdai)
Expeditions generally make at least three trips up the mountain from Everest Base Camp (which is higher than nearly every mountain in Europe at 17,600 feet), going a few thousand feet higher with each successive trip, before making a push for the top.
Over the course of weeks, the body starts to make more hemoglobin (the protein in red blood cells that helps carry oxygen from the lungs to the rest of the body) in order to compensate for the change in altitude.
But too much hemoglobin can thicken your blood, making it harder for the heart to pump blood around the body. That can lead to a stroke or the accumulation of fluid in your lungs.
A quick stethoscope check can reveal a clicking sound as fluid that’s leaked into the lungs rattles around – a condition called high altitude pulmonary edema (HAPE).
Symptoms include fatigue, a feeling of impending suffocation at night, weakness, and a persistent cough bringing up white, watery, or frothy fluid. Sometimes the coughing is so severe that it cracks or separates ribs.
Climbers with HAPE are always short of breath, even when resting.
In the Death Zone, your brain can start to swell due to lack of oxygen, which can lead to nausea and a form of high-altitude psychosis
One of the biggest risk factors at 26,000 feet is hypoxia, a lack of adequate oxygen circulation to organs like your brain. That’s because acclimatization to Death Zone altitudes isn’t possible, high altitude expert and doctor Peter Hackett told PBS.
If your brain doesn’t get enough oxygen, it can start to swell, causing high altitude cerebral edema (HACE), which is HAPE for the brain. This swelling can trigger nausea, vomiting, and difficulty thinking and reasoning.
An oxygen-starved brain means climbers sometimes forget where they are, entering a delirium that some experts consider a form of high-altitude psychosis.
Hypoxic climbers’ judgment becomes impaired, and they have been known to do strange things like start shedding their clothes or talking to imaginary friends.
Other possible dangers include appetite loss, snow blindness, and vomiting
Impaired judgment and shortness of breath aren’t the only things high-altitude climbers have to worry about. “Humans will start to deteriorate,” Hackett added.
“Sleeping becomes a problem. Muscle wasting takes place. Weight loss takes place.”
Nausea and vomiting from altitude sickness, including HAPE and HACE, will cause a decrease in appetite. The glare from the endless snow and ice can cause snow blindness – temporary vision loss, or burst blood vessels in your eyes.
Some climbers are injured or perish from the indirect results of these high-altitude health problems. Physical weakening and impaired vision can lead to accidental falls.
Incorrect decision-making – from exhaustion or lack of oxygen – can mean forgetting to clip back into a safety rope, or straying from the route, or failing to properly prepare life-saving equipment like supplementary oxygen tanks.
(Lhakpa Sherpa)
Mountaineers survive the Death Zone by trying to climb it in a day, but people are currently stuck waiting for hours, which can be deadly
All told, climbing in the Death Zone is “a living hell,” as Everest climber and 1998 NOVA expedition member David Carter told PBS.
Typically, climbers attempting to bag the summit try and make it up and down in a single day of flurried activity, spending as little time as possible in the Death Zone before returning to safer altitudes. But this frenzied push to the finish line comes at the end of weeks of climbing, during one of the hardest parts of the route up.
Lhakpa Sherpa, who’s reached Everest’s summit nine times (more than any other woman on Earth) previously told Business Insider that the day a group attempts to summit Everest is by far the most difficult section of the trek.
In order to summit successfully, everything must go right. Around 10 pm, climbers leave their haven in Camp Four at 26,000 feet, just on the edge of the Death Zone. The first chunk of their climb is done wholly in the dark, lit by starlight and headlamps.
Seven hours later, typically, climbers reach the summit. After a brief rest filled with celebrations and photographs, the expeditions turn around, making the 12-hour trek back to safety and arriving (ideally) before nightfall.
But recently, expedition companies noted that the peak became so choked with climbers scrambling to the summit during a rare period of good weather that people were stuck waiting in the Death Zone for hours, leading some to collapse from exhaustion and die.
On May 22, when 250 climbers attempted to reach the mountain’s summit, The Kathmandu Post reported, many climbers had to wait in line to go up and down the mountain. These extra, unplanned hours in the Death Zone made the difference between life and death for 11 people.
This article was originally published by Business Insider.
More from Business Insider:
Have You Ever Wondered.
- How many people have climbed Mount Everest?
- What is a death zone?
- What happens to your body in Mount Everest’s death zone?
Today’s Wonder of the Day was inspired by Luke. Luke Wonders, “Why is the middle to the summit of Mount Everest called the death zone?” Thanks for WONDERing with us, Luke!
Would you ever go bungee jumping? How about parachuting out of an airplane? Maybe you’d like to try out a human catapult. These forms of recreation are thrilling for some. Others find them scary. If you’re looking for a sport with a bit of danger, you may enjoy mountain climbing.
Specifically, some thrill-seeking mountain climbers tackle the challenge of climbing Mount Everest. At 29,029 feet (8,848 meters) above sea level, it’s the highest mountain in the world. The first people to reach its summit were Sir Edmund Hillary and Tenzing Norgay in 1953. Since then, over 4,000 people have reached the mountain’s peak.
To do so, climbers must enter the most dangerous part of the mountain. It’s called the “death zone.” To prepare, climbers must give their bodies time to get used to higher altitude . That’s why they normally spend several weeks climbing Mount Everest. They stop to rest every few thousand feet. When they reach 26,247 feet (8,000 meters), they’ve entered the death zone.
How dangerous is the death zone? That far above sea level, the amount of oxygen in the atmosphere falls 40 percent. This makes it difficult for the human body to get the oxygen it needs. Combined with the physical exertion of climbing the mountain, this can be deadly. Some climbers have compared the experience to “running on a treadmill and breathing through a straw.”
Every cell in your body needs oxygen to carry out its job. For that reason, the low-oxygen nature of the death zone makes it a very dangerous place. It can have dire effects on the human body.
One of these is swelling of the brain. This may lead to high altitude cerebral edema (HACE). HACE can cause nausea and vomiting. Even more dangerous, it can lead to difficulty thinking. In the death zone, climbers can forget where they are or even have hallucinations . This can make a dangerous climb even more life-threatening.
Many climbers experience high altitude pulmonary edema (HAPE) in the death zone. Symptoms of HAPE include fluid in the lungs, fatigue, and weakness. Climbers affected by HAPE can also feel like they’re suffocating. They will have a persistent cough. They may cough up white, frothy fluid.
Other dangers posed by the death zone are snow blindness and frostbite. Snow blindness is the temporary inability to see due to the glare from snow and ice. Frostbite can affect any exposed skin. The temperatures on Mount Everest are low enough to freeze skin instantly.
Mount Everest isn’t the only peak with a death zone. In fact, the world’s 14 highest mountains all have death zones. All of these are located in the Himalaya and Karakoram Ranges on the continent of Asia. Some avid mountain climbers make it their goal to reach the top of all 14.
Would you like to climb Mount Everest one day? How would you protect yourself from the death zone? Mountain climbing requires both skill and preparation. If you’re interested in this sport, spend some time learning about the important safety precautions today.
What happens to your body in the death zone? In the death zone, climbers’ brains and lungs are starved for oxygen, their risk of heart attack and stroke is increased, and their judgment quickly becomes impaired. “Your body is breaking down and essentially dying,” Shaunna Burke, a climber who summited Everest in 2005, told Business Insider.
How long can you survive in the death zone? Humans have survived for 2 years at 5,950 m (19,520 ft) [475 millibars of atmospheric pressure], which appears to be near the limit of the permanently tolerable highest altitude.
What does the death zone feel like? Many climbers experience high altitude pulmonary edema (HAPE) in the death zone. Symptoms of HAPE include fluid in the lungs, fatigue, and weakness. Climbers affected by HAPE can also feel like they’re suffocating. They will have a persistent cough.
What is out of the death zone mainly about? The article is mainly about Poorna Malavath and her quest to climb Mount Everest. Poorna faced many challenges during her climb up Mount Everest. Poorna spent many months training to prepare for the climb. Poorna was able to overcome the challenges of Everest and made it to the top.
What happens to your body in the death zone? – Related Questions
Do bodies decompose on Everest?
Dead bodies litter Mount Everest because it’s so dangerous and expensive to get them down. 11 people have died summiting Mount Everest this spring. The deaths this year bring the total Everest death toll to more than 300 people since explorers first started climbing the mountain in the early 1900s.
Where is the death zone?
The death zone is the name used by mountain climbers for high altitude where there is not enough available oxygen for humans to breathe. This is usually above 8,000 metres (26,247 feet). Most of the 200+ climbers who have died on Mount Everest have died in the death zone.
Is Camp 4 in the death zone?
The death zone above camp 4 has taken many strong and skilled climbers lives.
How do people survive the death zone?
Mountaineers survive the Death Zone by trying to climb it in a day, but people are currently stuck waiting for hours, which can be deadly. The first chunk of their climb is done wholly in the dark, lit by starlight and headlamps. Seven hours later, typically, climbers reach the summit.
What is the 7 Summits Challenge?
The 7 Summits: Everest, Aconcagua, McKinley, Kilimanjaro, Elbrus, Vinson, Carstensz Pyramid. Almost 30 years ago Dick Bass and Franck Wells conceived the idea of the 7 Summits. This Challenge consists in climbing the highest mountain of each of the 7 continents. In both cases, Elbrus is considered as the top of Europe.
Does K2 have a death zone?
K2’s summit is well above the altitude at which high altitude pulmonary edema (HAPE), or high altitude cerebral edema (HACE) can occur. In mountaineering, when ascending above an altitude of 8,000 metres (26,000 ft), the climber enters what is known as the death zone.
Can you survive on K2?
Although K2 is almost impossible to climb without being caught in life-threatening weather, the best months to climb are June, July and August.
Can a normal person climb K2?
K2 is a Technical High Altitude Climb, Limiting the Attraction. With all due respect to Everest, there is little actual “climbing” by the normal routes.
How do mountain climbers poop?
Climbers use either ‘poop tubes’ or sealable bags to store their redundancies when climbing on big walls. Climbers don’t crotch over the edge of their portaledge and let their poop fall down. Of course, this would litter the climbing area, making a mess out of the wall.
Do planes fly over Everest?
Tim Morgan, a commercial pilot writing for Quora says aircraft can fly above 40,000 feet, and hence it is possible to fly over Mount Everest which stands at 29,031.69 feet. However, typical flight routes do not travel above Mount Everest as the mountains create unforgiving weather.
Why do they leave dead bodies on Everest?
Standard protocol is just to leave the dead where they died, and so these corpses remain to spend eternity on the mountaintop, serving as a warning to climbers as well as gruesome mile markers. One of the most famous corpses, known as “Green Boots” was passed by almost every climber to reach the death zone.
At what altitude can a human not breathe?
It is the lack of oxygen rather than the reduced air pressure that actually limits the height at which we can breathe. An elevation of about 20,000 feet above sea level is the maximum height at which sufficient oxygen exists in the air to sustain us.
Which mountain has killed the most climbers?
K2, on the Chinese-Pakistani border in the Karakorum Range, has one of the deadliest records: 87 climbers have died trying to conquer its treacherous slopes since 1954, according to Pakistan Alpine Club Secretary Karrar Haidri. Only 377 have successfully reached the summit, Haidri said.
What animals can survive and live on Mt Everest?
Although there are not many animals that can survive the harsh winter of the Everest Region to survive on the higher parts of the mountain, some can live till 6100 meters. The animals like the Blue-sheep, Pika, Tibetan Gazelle, and wild yak along with some other birds can live up to the altitude of 6100 meters.
Why K2 is harder than Everest?
The main reasons why K2 is a tougher climb than Everest are the lack of Sherpas, support, fixed ropes and routes on K2, more unpredictable weather and avalanches, the technicality and immediate steepness of the climb and the logistics of the climb and trek.
How cold is it at the peak of Mount Everest?
The weather and climate of Mount Everest is one of extremes. Temperatures at the summit are never above freezing and during January temperatures can drop as low as -60° C (-76° F). Despite the low temperatures the biggest issue faced by climbers are hurricane force winds and wind chill.
What is the biggest cause of death on Mount Everest?
The main reasons for people dying while climbing Mount Everest are injuries and exhaustion. However, there is also a large proportion of climbers who die from altitude related illness, specifically from high altitude cerebral oedema (HACE) and high altitude pulmonary oedema (HAPE).
How big is the Khumbu Icefall?
With elevations of 4,900 m (16,100 ft) at its terminus to 7,600 m (24,900 ft) at its source, it is the world’s highest glacier.
Which is harder to climb K2 or Everest?
Although Everest is 237m taller, K2 is widely perceived to be a far harder climb. “No matter which route you take it’s a technically difficult climb, much harder than Everest. The weather can change incredibly quickly, and in recent years the storms have become more violent.
How much does it cost to climb the 7 summits?
findings. The average cost to climb all the seven summits is $162,139.
Is Everest still growing?
Growth of Everest
The Himalayan mountain range and the Tibetan plateau were formed as the Indian tectonic plate collided into the Eurasian plate about 50 million years ago. The process continues even today, which causes the height of the mountain range to rise a tiny amount every year.
