China's Shenzhou-21 crew during the third spacewalk. (Photo: CMSA)

The Shenzhou-21 crew aboard China's orbiting space station completed their mission's third series of extravehicular activities on Friday, according to the China Manned Space Agency.

The astronaut trio -- Zhang Lu, Wu Fei and Zhang Hongzhang -- worked for roughly 5.5 hours and completed their tasks at 1:36 a.m. (Beijing Time), assisted by the space station's robotic arm and a team on Earth.

To date, Zhang Lu has conducted a total of 7 extravehicular activities, setting a new record for the most spacewalks by a Chinese astronaut.