Mount Hakkoda disaster
The  occurred on January 23, 1902, when a group of Imperial Japanese Army soldiers became lost in a blizzard on the Hakkōda Mountains in Aomori Prefecture in northern Honshu, Japan, en-route to Tashiro Hot Spring located in the Hakkōda Mountains. The 199 deaths during a single ascent make it the most lethal disaster in the modern history of mountain climbing. Deadliest mountaineering disaster 
The world's worst mountaineering disaster, according to the Guinness Book of Records, is the Lenin Peak disaster, in which 43 people died. In the case of the Hakkouda Disaster, although it was a military disaster, they were not training for shooting or combat training. they were simply climbing a winter mountain to reach their destination, a hot spring. If mountaineering is defined as aiming for a mountain destination with the itinerary and route planned in advance, then the Hakkouda Disaster is the deadliest mountain disaster in the world, with 199 people died in a single climb. Background 
In the prelude to the Russo-Japanese War, the Imperial Japanese Army deemed it necessary to secure a route through the Hakkōda Mountains in the event that roads and railways were destroyed by shelling of the Aomori coastline by the Imperial Russian Navy during wintertime. Training in movement during winter conditions was also deemed necessary in light of a potential war with Russia, so a wintertime crossing of the Hakkōda Mountains was planned. The IJA's 8th Division's Fifth Infantry Regiment was stationed in the city of Aomori. The 210-man unit that made the march into the Hakkōda Mountains in the snow was selected from the 3,000-man Fifth Infantry Regiment, but consisted of many men who originated from a region with little snow and lacked experience in climbing snowy mountains. The unit also did not use local guides. Incident 
The troops, slowed by their heavy supply sleds, set out from Aomori at 6:55 AM on January 23, 1902. Their objective was Tashiro Hot Spring located  away in the Hakkōda Mountains. At 4:00 PM on January 23, the unit reached the summit of Umatateba (732m / 2,402 ft), which was only four kilometers from the first day's objective, Tashiro Hot Spring. The unit missed the expected return date on January 24, but the regimental HQ at Aomori remained optimistic until January 26, when a 60-man rescue party to track and find the missing men was dispatched. On day 3, January 25, 1902, the weather changed suddenly, and a temperature of -41 degrees (-41.8 Fahrenheit) was observed—the lowest in Japanese weather observation history, and there was an enormous low-pressure system in the skies above the Hakkōda Mountains. In the midst of the deep snow and blizzard, the soldiers wandered the northeast slope of the Hakkōda Mountains for several days. On January 27, the fifth day since their departure, Corporal Fusanosuke Goto, standing buried in the snow, became the first survivor discovered by the rescue party. The disaster which struck the unit marching through the Hakkōda Mountains was established based on Corporal Goto's testimony. The 5th Regiment and the 8th Division finally were placed full-alert and launched major search-and-rescue/recover operations which lasted for months and involved tens of thousands of soldiers and villagers in total. The last survivor was found on February 2 and the last body was recovered on May 28. Overall, 193 of the 210 men froze to death en route. A further six died within two months after rescue. Eight out of 11 survivors had to have limbs amputated due to frostbite, including Goto. Legacy 
In 1971, Jirō Nitta published Death March on Mount Hakkōda:(八甲田山死の彷徨, Hakkōdasan shi no hōkō), a semi-fictional account of the disaster. James Westerhoven translated the book into English. Journalist Koshu Ogasawara spent many years covering the Hakkouda disaster. After receiving numerous documents from Koshu Ogasawara, novelist Jirō Nitta published "Hakkouda-san: Death's Wandering" (Mt. Hakkouda: Death's Wandering). The screenwriter Shinobu Hashimoto, who is also famous for Akira Kurosawa's "Seven Samurai," adapted the novel and produced the 1977 movie Mount Hakkoda (1977 film)(八甲田山). However, both the novel and the film are partly fictionalized, and there are many discrepancies with the facts. In 1978, a Hakkoda Disaster museum opened next to the army cemetery in Aomori. “Mt. Hakkoda (2014 film)’”(The world’s worst mountaineering disaster - 八甲田山 世界最大の山岳遭難事故), a film based on historical facts, was released in 2014. References

External links 
 
 The Hakkōda Mountains Incident (Short Documentary)

1902 disasters in Japan
Man-made disasters in Japan
1902 in Japan
Mountaineering disasters
Mountaineering in Japan
Aomori (city)
January 1902 events