Everest, Japanese and Hornbein Couloirs. A Swedish expedition led by Jack Berg made the ascent of Everest via the Japanese and Hornbein Couloirs. On May 15, two Sherpas, Mingma Norbu and Galbyu got to the top. They were followed on May 20 by Lars Cronlund, who was reported to have suffered quite severe frostbite. Other expeditions have spoken highly of medical care they received from the expedition’s medical team.