Pilot trainee Zhao Chengya waves before entering Jiaolong, China's deep-sea manned submersible, in the southwest Indian Ocean, Jan. 11, 2015. Zhao Chengya, China's second female pilot trainee for deep-sea manned sub, dived on Sunday as copilot with Jiaolong. China recruited six pilot trainees for deep-sea manned sub out of 130 candidates in 2013 and two of the six are female. (Xinhua/Zhang Xudong)