Three men spent 24 hours in ice huts with freezing temperatures in the Frozen for 24 Hours event held in Changsha city in central China's Hunan Province earlier this week.
The challenge began at around 2pm on Sunday and lasted until 2pm on Monday.
They had to stay in rooms built of ice, 1.8m long, 1.8m wide and 2m high.
The ice used to construct the rooms weighed over 50kg.
The temperature in the ice rooms was maintained at -5C.
The challengers had to remain in the ice room for 24 hours without eating, drinking, sleeping or resting.
One challenger quit 14 hours into the event.
Cui Deyi, known as Huangshan Mountain Polar Bear, Wang Baoyu, known as Dentist-the Great White, and Xiang Yong successfully completed the challenge.
Cui Deyi has world records for winter swimming in the Arctic Sea, while Wang Baoyu holds numerous world records for surviving in extremely low-temperature water.