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In this photo from May 18, 2013, Climbers make their way to the summit of Mount Everest, in the Khumbu region of the Nepal Himalayas. Nepal celebrated the 60th anniversary of the conquest of Mount Everest on Wednesday, May 29, 2013, by honoring climbers who followed in the footsteps of Edmund Hillary and Tenzing Norgay. (AP Photo/Alpenglow Expeditions, Adrian Ballinger) ( Nepal Everest Anniversary )

In this Saturday, May 18, 2013 photo, climbers from various countries make their way down towards Camp 4 on their way to summit the 8,850-meter (29,035-foot) Mount Everest. May is the most popular month for Everest climbs because of more favorable weather. Earlier this month, an 80-year-old Japanese man Yuichiro Miura became the oldest conqueror of Mount Everest and Raha Moharrak became the first woman from Saudi Arabia to scale the peak. (AP Photo/ Pasang Geljen Sherpa) ( Nepal Everest )

In this Sunday May 19, 2013 photo, climbers are seen descending after scaling the 8,850-meter (29,035-foot) Mount Everest, peak seen on left. (AP Photo/ Pasang Geljen Sherpa) ( Nepal Everest )

Sir Edmund Hillary, the New Zealand mountaineer and explorer who as a member of John Hunt's Everest expedition, reached the summit with Sherpa Tensing in 1953. Hillary and Tenzing Norgay reached the summit of Mount Everest on May 29 of that year. In 2013, to mark the anniversary of the climb, Queen Elizabeth II and Prince Philip, Duke of Edinburgh attended a reception to mark the feat of the two men where they met their sons at the Royal Geographic Society in London. Photo by Baron/Getty Images) ( 3260407 )

Sherpa Tensing, Tenzing Norkay or Tenzing Norgay summited Mount Everest in 1953 with Sir Edmund Hillary. Norgay and Hillary reached the summit of Mount Everest on May 29 of that year. In 2013, to mark the anniversary of the climb, Queen Elizabeth II and Prince Philip, Duke of Edinburgh attended a reception to mark the feat of the two men where they met their sons at the Royal Geographic Society in London. (Photo by Baron/Getty Images) ( 3368706 )

Boots for Hillary and Norgay's expedition were handmade by Messrs. Robert Lawrie Ltd of London. The boot on the right is still under construction, and the fur interlining can be seen. The boots were built to be durable at heights of 23,000 feet. (Photo by Ron Burton/Keystone/Getty Images) ( 133469165 )

Climbers navigate the knife-edge ridge just below the Hillary Step on their way to the summit of Mount Everest, in the Khumbu region of the Nepal Himalayas on May 18, 2013. Sixty years ago Wednesday, Sir Edmund Hillary and climbing partner Tenzing Norgay were the first to set foot on the summit of Mount Everest, the highest point on earth on May 29, 1953. (AP Photo/Alpenglow Expeditions, Adrian Ballinger) ( Nepal Everest Ascent Anniversary )

In this Tuesday, May 16, 2013 photo, tents are pitched on Camp 2, as climbers rest on their way to summit the 8,850-meter (29,035-foot) Mount Everest. May is the most popular month for Everest climbs because of more favorable weather. Earlier this month, an 80-year-old Japanese man Yuichiro Miura became the oldest conqueror of Mount Everest and Raha Moharrak became the first woman from Saudi Arabia to scale the peak. (AP Photo/ Pasang Geljen Sherpa) ( Nepal Everest )

In this May 20, 2013 photo, climbers from various countries make their way down after scaling the 8,850-meter (29,035-foot) Mount Everest. (AP Photo/ Pasang Geljen Sherpa) ( Nepal Everest )

Edmund Hillary and Sherpa Tenzing Norgay smile as they have breakfast in Kathmandu, Nepal after a 170-mile trek from their conquest of Mount Everest on June 20, 1953. (AP Photo) ( Nepal Hillary Tenzing )

In this May 16, 2013 photo, Nepalese Sherpas rest on their way to summit the 8,850-meter (29,035-foot) Mount Everest. May is the most popular month for Everest climbs because of more favorable weather. Earlier this month, an 80-year-old Japanese man Yuichiro Miura became the oldest conqueror of Mount Everest and Raha Moharrak became the first woman from Saudi Arabia to scale the peak. (AP Photo/ Pasang Geljen Sherpa) ( Nepal Everest )

Eighty-year-old Japanese extreme skier Yuichiro Miura, right, who has had four heart operations in recent years, stands atop the summit of Mount Everest as he becomes the oldest person to climb the world's tallest mountain Thursday, May 23, 2013. Miura, who also conquered the 29,035-foot (8,850-meter) peak when he was 70 and 75, reached the summit at 9:05 a.m. local time, according to a Nepalese mountaineering official and Miura's Tokyo-based support team. (AP Photo/MIURA DOLPHINS CO., LTD.) ( Nepal Everest Octagenarians )

A team of climbers, including 80-year-old Japanese mountaineer Yuichiro Miura, stand on the summit of Mount Everest, in this photo taken by Kyodo May 23, 2013. He was accompanied by three other Japanese, including his son, and six Nepali sherpas. REUTERS/Kyodo ( NEPAL-EVEREST/OLDEST )

Explorers Sardar Tenzing Norgay of Nepal, left, and Sir Edmund Hillary of New Zealand who conquered Mount Everest in 1953, are shown in this 1953 handout photo. May 29, 2013, marked the 60th anniversary of Hillary's and Norgay's conquest of the highest mountain on earth. (AP Photo/NZPA,Penguin Books) ( Obit Edmund Hillary )

From left, Colonel John Hunt, Tenzing Norgay and Edmund Hillary make a jubilant return to Britain after becoming the first men to scale Mount Everest. May 29, 2013, marked the 60th anniversary since Sir Edmund Hillary and Nepalese Sherpa Tenzing Norgay became the first to reach the summit of Mount Everest on the Nepal-Tibet border. (Photo by George W. Hales/Fox Photos/Getty Images) ( 3401083 )

In this image from sunrise on Saturday, May 18, 2013, climbers make their way to the summit of Mount Everest, in the Khumbu region of the Nepal Himalayas. Nepal celebrated the 60th anniversary of the conquest of Mount Everest on Wednesday, May 29, 2013, by honoring climbers who followed in the footsteps of Edmund Hillary and Tenzing Norgay. (AP Photo/Alpenglow Expeditions, Adrian Ballinger) ( Nepal Everest Anniversary )

Climbers make their way to the summit of Mount Everest, in the Khumbu region of the Nepal Himalayas on May 18, 2013. Nepal celebrated the 60th anniversary of the conquest of Mount Everest on Wednesday, May 29, 2013, by honoring climbers who followed in the footsteps of Edmund Hillary and Tenzing Norgay. (AP Photo/Alpenglow Expeditions, Adrian Ballinger) ( Nepal Everest Anniversary )

Nepalese Sherpas climb Khumbu Icefall, above Base Camp on their way to summit the 8,850-meter (29,035-foot) Mount Everest on May 16, 2013. May is the most popular month for Everest climbs because of more favorable weather. (AP Photo/ Pasang Geljen Sherpa) ( Nepal Everest )

Edmund Hillary, left, Col. John Hunt, and Tenzing Norgay, take a last look at Mount Everest before leaving Katmandu, Nepal in this July 1953 file photo. Hillary and Norgay share honors as the first men to conquer the world's highest peak. Col. Hunt led the British Everest Team of which they were members. (AP/Photo, File) ( HILLARY RECALLS )

On May 29, 1953, Sir Edmund Hillary of New Zealand became the first person to reach the top of Mount Everest. Here he catches up on some mail after coming down from the summit of the world's highest mountain. Denver Post Archive Photo ( hillary )

May 29, 2013, marked 60 years since Sir Edmund Hillary and Nepalese Sherpa Tenzing Norgay became the first to reach the summit of Mount Everest on the Nepal-Tibet border. The pair reached the peak, 29,028 feet up, after an exhausting climb up the southern face. 3rd July 1953: With the aid of a model, mountaineers Edmund Hillary, Colonel John Hunt and Sherpa Tensing Norgay present an account of their ascent of Mount Everest at a press conference at the Royal Geographical Society, Kensington, London. (Photo by Fred Ramage/Keystone/Getty Images) ( 3425418 )

Sir Edmund Hillary and his wife Louise display in January 1954 a book about his victory over Mt. Everest as they arrive bu train in Val D'Isere. AFP PHOTO (Photo credit should read -/AFP/Getty Images) ( RPH2003051516880 )

New Zealand's Sir Edmund Hillary makes a speech during the 50th Anniversary of Scott Base celebration, at Scott Base, Antarctica. Hillary, the unassuming beekeeper who conquered Mount Everest, is known as one of the 20th century's greatest adventurers. He died in 2008 at age 88. (AP Photo/Wayne Drought, File) ( YE Obit Hillary )

Climbers navigate the Hillary Step just below the summit of Mount Everest, in the Khumbu region of the Nepal Himalayas on May 18, 2013. (AP Photo/Alpenglow Expeditions, Adrian Ballinger) ( Nepal Everest Ascent Anniversary )

A climber prepares to descend the Hillary Step as he makes his way down from the summit of Mount Everest, in the Khumbu region of the Nepal Himalayas on May 18, 2013. Nepal celebrated the 60th anniversary of the conquest of Mount Everest on Wednesday, May 29, 2013, by honoring climbers who followed in the footsteps of Edmund Hillary and Tenzing Norgay. (AP Photo/Alpenglow Expeditions, Adrian Ballinger) ( Nepal Everest Anniversary )

Climbers from various countries descend Khumbu Icefall on their way back to Base Camo after summiting the 8,850-meter (29,035-foot) Mount Everest on May 22, 2013. (AP Photo/ Pasang Geljen Sherpa) ( Nepal Everest )

Edmund Hillary, second from left, of the British Everest Expedition, who with the Sherpa Tenzing Norgay, was the first to make the ascent of the peak of Mt. Everest. He stands with Tenzing, third from left, and two of Tenzing's nieces, Droma, left, and Phulima, far right, who climbed with the expedition to 23,000 feet. Photo was made at Dhullal Ghat, after the returning party descended from Namche Bazar June 19, 1953. (AP Photo) ( EVEREST HILLARY )

In this May 22, 2013 photo distributed by Miura Dolphins Co. Ltd., 80-year-old Japanese extreme skier Yuichiro Miura, right, and his son, Gota pose at their South Col camp at 8,000 meters (26,247 feet) before their departure for Camp 5 during their attempt to scale the summit of Mount Everest. Miura, who climbed Mount Everest five years ago, but just missed becoming the oldest man to reach the summit, was back on the mountain Wednesday to make another attempt at the title. (AP Photo/Miura Dolphins Co. Ltd.) MANDATORY CREDIT ( Nepal Everest Octagenarians )

In this Saturday, May 17, 2013 photo provided by Raha Moharrak, Moharrak stands on the 8,850-meter (29,035-foot) Mount Everest peak. Moharrak, the first woman from Saudi Arabia to scale Mount Everest, said she doesn't intend to inspire a movement, but would be happy to change people's opinions of Saudi women and Saudi women's opinions of themselves. (AP Photo/Ang Norbu Sherpa) ( Nepal Saudi Arabia Everest )

Edmund Percival Hillary, 34, left, and Sherpa Tenzing Norgay, the 39-year-old Sherpa Sirdar, who reached the 29,002-feet summit of Mount Everest stand with garlands about their shoulders, wearing the specially struck gold medals with which they were presented by Dr. Rajendra Prasad, the Indian President, unseen, in New Delhi, India on June 29, 1953. They made the summit on May 29th. (AP Photo) ( India Everest Expedition )

Participants of the Tenzing Hillary Everest Marathon begin their race at the Everest base camp in the Khumbu region of the Nepal Himalayas, Wednesday, May 29, 2013. Nepal celebrated the 60th anniversary of the conquest of Mount Everest on Wednesday by honoring climbers who followed in the footsteps of Edmund Hillary and Tenzing Norgay. (AP Photo/Himex Nepal, Dinesh Gole) ( Nepal Everest Anniversary )

The Tenzing-Hillary Everest Marathon, the world’s highest marathon, starts near the famous Khumbu Ice Fall at Qomolangma Base Camp (5,364 meters above sea level) and finishes at Namche Bazar (3,440 meters above sea level), on May 29, 2013. Nepali athlete Ram Kumar Rajbhandari (31) clinched the title of the 11th Tenzing Hillary Everest Marathon, completing the 42.19 km race in 3 hour 59 minute 45 seconds as Nepali athletes continued their dominance in the highest altitude marathon claiming all top ten positions. AFP/Getty/ HIMEX-Tenzing-Hillary Everest Marathon ( 520137661 )

In this handout photograph released by Himex, the organisers of the Tenzing-Hillary Everest Marathon on May 29, 2013, participatants of the marathon are flagged off at Everest Base Camp in Nepal's Solukhumbu district. The Tenzing-Hillary Everest Marathon, the world’s highest marathon, starts near the famous Khumbu Ice Fall at Qomolangma Base Camp (5,364 meters above sea level) and finishes at Namche Bazar (3,440 meters above sea level). Nepali athlete Ram Kumar Rajbhandari (31) clinched the title of the 11th Tenzing Hillary Everest Marathon, completing the 42.19 km race in 3 hour 59 minute 45 second on Wednesday as Nepali athletes continued their dominance in the highest altitude marathon claiming all top ten positions. AFP/Getty/HIMEX-Tenzing-Hillary Everest Marathon ( 520137677 )

Participants of the Tenzing Hillary Everest Marathon begin their race at the Everest base camp in the Khumbu region of the Nepal Himalayas, Wednesday, May 29, 2013. Nepal celebrated the 60th anniversary of the conquest of Mount Everest on Wednesday by honoring climbers who followed in the footsteps of Edmund Hillary and Tenzing Norgay. (AP Photo/Himex Nepal, Dinesh Gole) ( Nepal Everest Anniversary )

Amelia Rose Hillary, granddaughter of Edmund Hillary,†participates in a function to mark the 60th anniversary of the conquest of Mount Everest at the British Embassy, in Katmandu, Nepal, Wednesday, May 29, 2013. Edmund Hillary and Tenzing Norgay reached the summit of Everest on May 29, 1953. Since then thousands of people have reached the 8,850-meter (29,035-foot) peak. (AP Photo/Niranjan Shrestha) ( Nepal Everest Anniversary )

Nepalese people take out a rally to mark the 60th anniversary of successful ascent of Mount Everest, in Katmandu, Nepal, Wednesday, May 29, 2013. Edmund Hillary and Tenzing Norgay were the first people to set foot on the peak of Mount Everest on May 29,1953. (AP Photo/Niranjan Shrestha) ( Nepal Everest Ascent Anniversary )

Britain's Queen Elizabeth II (C) and Prince Philip, Duke of Edinburgh (2L) attend a reception to celebrate the 60th Anniversary of the first ascent of Mount Everest in 1953, at the Royal Geographical Society in Kensington, west London on May 29, 2013. Nepalese sherpa Tenzing Norgay and New Zealand mountaineer Edmund Hillary conquered the summit of Mount Everest in a British-funded expedition in 1953. AFP PHOTO / POOL / YUI MOKYUI MOK/AFP/Getty Images ( 520149848 )

LONDON - MAY 29: Queen Elizabeth II, accompanied by Henry Day (6th L), Chairman of the Mount Everest Foundation, is shown a model of the mountain, at a reception to celebrate the 60th Anniversary of the ascent of Everest, at the Royal Geographical Society in Kensington, on May 29, 2013 in west London, England. (Photo by Yui Mok - WPA Pool/Getty Images) ( 169634600 )

Queen Elizabeth II meeting Nepalese Sherpa mountain climber Jamling Norgay, left, son of Tenzing Norgay, during a reception to celebrate the 60th Anniversary of the ascent of Everest, at the Royal Geographical Society in Kensington, west London, Wednesday May 29, 2013. (AP Photo/Yui Mok, Pool) ( Britain Everest Ascent Anniversary )

Media film the statues of Edmund Hillary, left, and Tenzing Norgay during a function to mark the 60th anniversary of successful ascent of Mount Everest, in Katmandu, Nepal, Wednesday, May 29, 2013. Hillary and Norgay were the first people to set foot on the peak of Mount Everest on May 29, 1953. (AP Photo/Niranjan Shrestha) ( Nepal Everest Ascent Anniversary )

A cake in the shape of Mount Everest is pictured during a program organized at the British Embassy of Nepal to mark the 60th anniversary of Sir Edmund Hillary and Tenzing Norgay Sherpa's conquest of Mount Everest in Kathmandu May 29, 2013. REUTERS/Navesh Chitrakar (NEPAL - Tags: ANNIVERSARY SOCIETY FOOD) ( NEPAL/ )

Yuichiro Miura, an 80-year-old Japanese mountaineer who became the oldest person to reach the top of Mount Everest last Thursday, speaks during a press conference at CLARK Memorial International High School in Tokyo, Wednesday, May 29, 2013. Miura said he almost died during his descent and does not plan another climb of the worldís highest peak, though he hopes to do plenty of skiing. (AP Photo/Shizuo Kambayashi) ( Japan Nepal Everest Octogenarian )

Eighty-year-old Japanese adventurer Yuichiro Miura, right, is greeted by his friend climber Kenji Kondo while resting at his camp at 6,500 meters (21,325 feet) during his attempt to scale the summit of Mount Everest. (AP Photo/Miura Dolphins) ( Nepal Everest Japan Oldest Climber )

Eighty-year-old Japanese adventurer Yuichiro Miura, right, and his son, Gota, rest on their way to a camp at 6,500 meters (21,325 feet) from a camp at 6,050 meters (19,849 feet) during their attempt to scale the summit of Mount Everest on May 18, 2013. Miura became the oldest person to reach the world's highest peak on Thursday, May 23. (AP Photo/Miura Dolphins) ( Nepal Everest Japan Oldest Climber )

Kancha Sherpa, left, the only survivor of the first successful expedition to Mount Everest participates in a function to mark the 60th anniversary of successful ascent of Mount Everest, in Katmandu, Nepal, Wednesday, May 29, 2013. Edmund Hillary and Tenzing Norgay were the first people to set foot on the peak of Mount Everest on May 29, 1953. (AP Photo/Niranjan Shrestha) ( Nepal Everest Ascent Anniversary )

Nepalese women wearing traditional Sherpa attire participate in a rally to mark the 60th anniversary of successful ascent of Mount Everest, in Katmandu, Nepal, Wednesday, May 29, 2013. Edmund Hillary and Tenzing Norgay were the first people to set foot on the peak of Mount Everest on May 29, 1953. (AP Photo/Niranjan Shrestha) ( Nepal Everest Ascent Anniversary )

Amelia Rose Hillary, granddaughter of New Zealand mountaineer Edmund Hillary, offers garlands to the statues of Tenzing and Hillary during the Mount Everest Diamond Jubilee celebrations in Kathmandu on May 29, 2013. Nepal marked 60 years since the first ascent of Everest May 29, celebrating the summiteers whose success has bred an industry that many climbers now fear is ruining the world's highest peak. PRAKASH MATHEMA/AFP/Getty Images ( 520132577 )

Sinha (C) poses with the Indian flag on Mount Everest, on May 28, 2013. Twenty-six year old Sinha, from the northern state of Uttar Pradesh, who lost her leg after she was thrown from a moving train two years ago, became the first female amputee to climb Everest on May 21. AFP PHOTO/ ARUNIMA SINHA ( 520120584 )

Sherpa Tensing Norgay who died in Indian city of Darjeeling aged 72, is pictured, with Sir Edmund Hillary, on May 9, 1986, after their successful attempt to climb Everest. (AP Photo) ( Sherpa Tensing Norgay and Sir Edmund Hillary )

Italian mountaineer Reinhold Messner (L), Nepalese mountaineer Phurba Tashi Sherpa (2nd L), and Migma Sherpa (R) sit in a horse-drawn carriage during a procession for Everest Summitteers during the Mount Everest Diamond Jubilee celebrations in Kathmandu on May 29, 2013. Messner was the first person to climb Everest without oxygen. Nepal marked 60 years since the first ascent of Everest May 29, celebrating the summiteers whose success has bred an industry that many climbers now fear is ruining the world's highest peak. PRAKASH MATHEMA/AFP/Getty Images ( 520132609 )