Thick murky clouds fill the sky, with freezing winds carrying snow faster than 160km per hour.
With a frigid –34 degrees Celsius temperature, life-threatening snowstorms and avalanches are frequent.
And these are typical conditions on the world's highest mountain: Mount Everest.
The behemoth towers 8,849 metres between Nepal and Tibet in the Himalayas, with its peak surpassing most clouds in the sky.
An attempt to climb Everest requires months, sometimes years, of training and conditioning – even then, reaching the summit is far from guaranteed.
In fact, more than 300 people are known to have died on the mountain.
And yet the mountain still draws hundreds of climbers who are determined to reach its peak every spring.
Here's what it takes to make the climb and what has motivated some climbers to summit the world's highest peak.
'I thought I was in pretty good shape'
Dr Jacob Weasel, a trauma surgeon, successfully summited Everest last May after conditioning for nearly a year.
"I would put on a 50-pound (22kg) backpack and do two hours on a stair stepper with no problem," Weasel told CNN.
"So, I thought that I was in pretty good shape."
However, the surgeon said he was humbled after discovering that his fitness was no match for the lofty athleticism required by the mountain.
"I would take five steps and have to take 30 seconds to a minute to catch my breath," Weasel recalled of his struggle with the lack of oxygen available while ascending Everest.
Climbers aiming for the summit usually practice an acclimatising rotation to adjust their lungs to the thinning oxygen levels once they arrive on the mountain.
This process involves mountaineers traveling upward to one of the four designated camps on Everest and spending one to four days there before travelling back down.
This routine is repeated at least two times to allow the body to adapt to declining oxygen levels. It increases a climber's chances of survival and summiting.
"If you took somebody and just plopped them up at the high camp on Everest, not even on the (top), they would probably go into a coma within 10 to 15 minutes," Weasel said.
"And they would be dead within an hour because their body is not adjusted to that low of oxygen levels."
While Weasel has successfully summited dozens of mountains, including Kilimanjaro (5895m), Chimborazo (6263m), Cotopaxi (5896m), and most recently Aconcagua (6960m) in January, he said none of them compares to the high-altitude of Mount Everest.
"Because no matter how well you are trained, once you get to the limits of what the human body can take, it's just difficult," he continued.
At its highest altitude, Everest is nearly incapable of sustaining human life and most mountaineers use supplementary oxygen above 7010 m.
The lack of oxygen poses one of greatest threats to climbers who attempt to summit, with levels dropping to less than 40 per cent when they reach the Everest "death zone."
'It's difficult to survive up there'
The first target for mountaineers is Everest base camp at approximately 5181m which takes climbers about two weeks.
Then they ascend to the three remaining camps stationed along the mountain.
Camp four, the final one before the summit, sits along the edge of the death zone at 7924m, exposing climbers to an extremely thin layer of air, subzero temperatures, and high winds powerful enough to blow a person off the mountain.
"It's difficult to survive up there," Weasel told CNN.
He recalls passing bodies of climbers who died on the mountain – which isn't uncommon.
The bodies of the fallen mountaineers are well-preserved, exhibiting little to no decay due to the intense cold temperatures.
"I am probably more familiar with death and the loss of life than most people," the surgeon said. "For me it was just a reminder of the gravity of the situation and the fragility of what life is… even more so motivation for appreciating the opportunity."
High-altitude cerebral edema (HACE) is one of the most common illnesses climbers face while attempting to summit. "Your brain is starved of oxygen," Weasel said.
HACE results in the brain swelling during its attempt to regain stable oxygen levels, causing drowsiness, trouble speaking and thinking.
This confusion is often accompanied by blurred vision and sporadic episodes of delusion.
"I had auditory hallucinations where I was hearing voices [of friends] that I thought were coming from behind me," Weasel recalled.
"And I had visual hallucinations," he added.
"I was seeing the faces of my children and my wife coming out of the rocks."
Weasel recalled crossing paths with a friend, Orianne Aymard, who was trapped on the mountain due to an injury.
"I remember staring at her for like five minutes and just saying, 'I'm so sorry,'" Weasel said.
"I've spent over a decade of my life training to help people as a surgeon, and being in a position where there's somebody who requires your help and you are unable to offer any assistance… that feeling of helplessness was tough to deal with," Weasel told CNN.
Aymard survived. She was rescued and suffered from several broken bones in her foot, in addition to severe frostbite on her hands.
Despite all her injuries, Aymard is considered one of the lucky ones.
'Their bodies will get frozen into the mountain'
Everest has long been a tomb for climbers who have succumbed to harsh conditions or accidents on its slopes.
When a loved one or fellow climber is severely injured or dies on the mountain, it's routine to leave them behind if you're unable to save them, according to Alan Arnette, a mountaineer coach who summited Everest in 2014.
"What most teams do out of respect for that climber, they will move the body out of sight," he said. And that's only if they can.
"Sometimes that's just not practical because of the bad weather, or because their bodies will get frozen into the mountain," Arnette told CNN.
"So, it's very difficult to move them."
Seeing a corpse on Everest is comparable to seeing a horrible car accident, according to the mountain coach. "You don't turn around and go home," Arnette said.
"You respectfully slow down… or say a prayer for that person, and then you continue."
It's been 10 years since the single deadliest accident on the world's highest mountain, after an avalanche killed 12 Sherpa guides.
And 2023 was recorded as the deadliest year on Everest, with 18 fatalities on the mountain – including five people that are still unaccounted for.
The process of recovering bodies is extensive, sometimes impossible.
Helicopter rescues and search missions are challenging due to the high altitude and frequently treacherous conditions, resulting in some rescuers dying in their attempt to save others.
'Watching the sunrise from 29,000 feet'
The 914 metre climb from camp four to the summit can take anywhere from 14 to 18 hours. Therefore, mountaineers typically leave the camp at night.
"That entire night was cold," Weasel recalled. "It's dark, it's windy." But it was proven to be worth it in the morning, he said.
"Watching the sunrise from 29,000 feet (8839m) and having that pyramid of Everest's shadow projected onto the valley below you…," Weasel told CNN.
"It was probably one of the most beautiful things I've ever seen in my life," he continued.
"It's weird standing up there and knowing that everything else on the planet is below where you're standing."
The size of the mountain is humbling, the surgeon said. "I've never felt so small," he recalled.
"That mixture of humility and connectedness with something bigger than yourself is the proper place from which we ought to approach our existence on this planet."
Like Weasel, Arnette summited at sunrise, and experienced this same feeling of "smallness."
At the top there were "more mountains than you can count," Arnette remembered. "It was a sense of enormous gratitude and at the same time I knew I had to get back down."
After about 20 minutes to an hour, climbers typically start to descend back to the base of the mountain.
'Bigger than yourself'
Before leaving for Nepal, Weasel was gifted an eagle's feather as a beacon for his Native American heritage.
He was determined to plant the feather on top of Everest "as a symbol of our people and what we've endured for the past several hundred years," Weasel told CNN.
"Showing that our spirit is not broken, but we're able to rise above the things that have happened to us," he added.
"I remember planting that eagle's feather on the top of the world and the feeling of real privilege that I felt in representing our people."
He wrote 105 words so offensive they sent two world powers to war
And this is why he decided to summit Everest, to be an example that anything is possible for young Native children and his tribe.
"Knowing what it's like up there, for me personally, the only real justification for going and putting your life, and other lives, at risk is if you're climbing for a reason that is much bigger than you," said Weasel.
Arnette attempted to climb Everest three times before he successfully summited.
"My first three tries, I wasn't clear on my why," Arnette said. When his mother was diagnosed with Alzheimer's disease, he looked at his purpose for climbing differently.
"I wanted to do it to raise money for Alzheimer's and honour my mother," Arnette said.
There are approximately 300 people that have been issued a permit from the Nepal government to climb the mountain this year, according to Arnette.
And he said the number is down from previous years.
"I think one of the reasons is because we had the 18 deaths last year, and people realize that Mount Everest is a dangerous mountain."
However, he doesn't believe that should deter climbers from attempting to summit. "I'm a big believer that when you go climb these mountains that you come home a better version of yourself," Arnette told CNN.
"Everest has become too commercialised with 'you're stepping over dead bodies' and 'it's littered with trash,'" the mountain coach said.
"The reality is that it is a very small degree all of that, but there's a lot of joy that people get out of doing it," he continued.
"And that's the reason that we climb mountains."
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