The main gymnasium and natatorium of the Hangzhou Olympic Sports Center is under construction in Hangzhou, Zhejiang province, on Feb 24. [Photo/zjol.com.cn]

To date, 85 percent of the cellar structure of the building has been completed, along with part of the spectator stands. Plans are to complete construction of the external roof and curtain wall and start interior decoration this year. [Photo/zjol.com.cn]

The project, with a total floor space of 397,000 square meters, is expected to conclude by the end of 2020. As components of one of the main venues for the 2022 Hangzhou Asian Games, the gymnasium and natatorium can house 18,000 and 6,000 people respectively. [Photo/zjol.com.cn]