Three Sherpa brothers are hoping to set a new record for time spent at the summit of Mount Everest.
The siblings Pemba Dorje, 31, Nima Gyalzen, 23, and Phurba Tenzing, 20 flew from Katmandu Sunday to the foothills of Everest. They are expected to reach the mountain's base camp in a few days with their teammates and supplies.
The brothers expect to reach the 8, 850 meter summit in May and spend 24 hours at the top.
The mountain's summit is known as "the death zone" because of the extreme weather conditions, including low levels of oxygen, high winds, and severe cold.
The brothers say they plan to spend their time on the summit praying and documenting the effect of the changing temperatures on their bodies.
Most climbers spend only a few minutes at the top of the mountain, long enough to take a photograph.
All three brothers are experienced climbers. Each has climbed Mount Everest several times.
The oldest brother holds the record for the fastest ascent of Mount Everest -- eight hours and 10 minutes.