2nd American climber dies on Mount Everest

ABC News' James Longman reports from Kathmandu, Nepal, where veteran climbers say a lack of oxygen and crowds are responsible for the 11 deaths this season.
2:47 | 05/28/19

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Transcript for 2nd American climber dies on Mount Everest
to that growing crisis on mt. Everest. A second American dying in just days bringing the total to 11 deaths already this season. But the danger isn't from avalanches or blizzards, veteran climbers say it's a lack of oxygen and the crowds. James Longman is there with more. Reporter: People travel here from all over the world to climb the tallest mountain on Earth. It's always been a dangerous game but this year has been more deadly than ever. More tragedy at the top of the world. 62-year-old American Christopher Kulish died while coming down from mt. Everest summit. His family says he passed away doing what he loved. He's now the 11th person and second American to die on the trek in the last ten days. We can expect five to seven deaths each year. To have 11 this year is Reporter: This season many experts warning of dangerous traffic jams forming at the peak and showing more than 300 hikers lined up on the mountain. You'd be sitting sometimes standing still for five 5, 10, 15 minutes in very cold conditions with very low oxygen because of the high altitude and using up your oxygen while you're standing there waiting. Reporter: This doctor from Arizona experienced it firsthand and says his guide was so worried to be pushed off the summit he attached a rope to him. I didn't feel safe to the point where I decided it was better to get my picture sitting down rather than standing up. Reporter: On Wednesday Utah climber don cash just finished his quest to climb the highest peaks on all seven continents when he collapsed and died from high altitude sickness. On Everest climbers are forced to wait for windows of good weather. When it clears everyone moves to the summit and with a large number of people, the longer wait means climbers are spending more time in what's called the death zone. That's above 28,000 feet with a lack of oxygen can be lethal. Less expensive expedition. You have to qualify to run the Boston particular Thon but not to attempt the highest mountain on the planet. Reporter: Around 200 people have died to climb it in the last 100 years or so. There's more competition than ever which means more danger. Cecilia. James, you've done some tough climbs like this. Ever see anything like that. Those lines are Hore Rick. When you go to the summit of a mountain, I was at 19,341, not 28,000 but we can be only at the summit for 30 minutes and can only stay at 16,000 for an hour. Someone died the week before on our same trek because of oxygen deprivation. That's the concerning. When you have to wait in long lines it's deadly. They'll have to change the policy. It's true.

This transcript has been automatically generated and may not be 100% accurate.

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