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Mount Everest has now officially grown by 86 centimeters.
China and Nepal have agreed on this.
All previous ascents are invalid because the mountaineers are 86 centimeters short of the summit of the highest mountain in the world.
The authorities want to set up a 86 centimeter high mountain in the base camp, on which the missing height can be reworked for a fee.
Indian researchers had determined a height of 8848 meters in the 1950s.
Since then, re-measurements have repeatedly resulted in different heights.
In 1982 a German expedition worked with a 100-meter-long ruler, which however slipped into a crevasse on the way.
A 20-strong British rope team tried using folding rules in 1991.
Each participant carried hundreds of them in their backpacks, which were carefully put together, but only reached up to 7,500 meters.
Only now could the real height be determined with the most modern means.
Chinese and Nepalese scientists used a heated measuring tape measuring 9,000 meters in length.