Ben Margot / AP
Two men who reached a granite cliff wall, known as El Capitan in Yosemite National Park, died on Saturday morning, the National Park Service said.
The agency said Jason Wells, 46, of Boulder, Colo. And Tim Klien, 42, of Palmdale, California, fell off the Freeblast climbing route and did not survive the fall.
Parkkeepers received calls at 8:15 am on Saturday morning and responded with search and rescue personnel.
Both were reportedly very experienced climbers.
The Freeblast route is one of the lower sections of the 3000-foot granite wall.
Climbing.com reports that the two men were tied together when they dropped 1,000 feet.
"Tim told me that Jason was the strongest and best partner he had ever climbed with," said Wayne Willoughby on the website where Tim's last name was written Klein.
Rangers are still investigating the cause of the accident.
The couple had climbed El Capitan several times and started climbing regularly while in college in San Diego, the site reports.
The page continues:
The "sad news marks the 25th accident resulting in a death on El Capitan. In recent years, Ryan Gordon died of nose in 2015 when he died Felix Kiernan died at the East Buttress after a crash in 2013 due to an accident caused by abseiling. In 2013, Felix Kiernan died at East Buttress after a hit Mason Robison died in 2013 when a block broke away from the Muir Wall and cut his line The first accident involving a climber on El Capitan was in 1968 by Jim Madsen, who rappelled down the line at the end of the race as he descended the wall to stop by a team at the Dihedral Wall. "
The valet parking service says more than 100 climbing accidents occur every year in California Park; 15-25 groups must be saved.
Climbing.com says the men are simul climbing where both climbers climb at the same time. The technique involves ropes, but the fall is still "incredibly dangerous because there is no anchor to carry the force of the fall."
Almost exactly a year ago, climber Alex Honnold caught the world's attention when he reached El Capitan reached its peak in just under four hours with a "free solo" without gear.
Honnold said in 2016 that the rock's Freeblast section is "like a 10-tone record," and large portions of El Capitan are "basically like running on a glass screen".