Fastest sea-to-summit ascent of Everest without supplementary oxygen (non-motorized)

The fastest time to climb to the top of Everest from a starting point at sea level using non-motorized transport is 67 days by Kim Chang-ho (South Korea), who began his "0 to 8,848 m" expedition on 14 March 2013 and finished on 20 May. He departed from Sagar Island in India, from where he kayaked up the Ganges, cycled to Nepal then walked to base camp.

Kim (1969–2018) kayaked 156 km (97 miles) up the Ganges from Sagar Island in the Bay of Bengal, cycled 893 km (555 miles) from northern India to Timlingtar in Nepal, then walked 162 km (100 mi) to Everest base camp. He made his ascent with no Sherpa support and without supplementary oxygen. Kim, who was inspired to take up mountain climbing after reading about Alexander the Great's expedition to Asia via Pakistan in 327 BCE, had previously climbed Everest in 2006 but with the use of bottled oxygen.

The attempt was marred by tragedy when one of Kim's climbing party, Seo Sung-Ho, who also climbed without bottled oxygen, died during the descent; the other climbers in the group opted for supplementary oxygen.