Jiuquan Satellite Launch Center, northwest China - May, 2022 (CCTV - No access Chinese mainland)
1. Various of Long March-2F carrier rocket inside assembly plant, technicians working

FILE: Jiuquan Satellite Launch Center, northwest China - Date Unknown (CCTV - No access Chinese mainland)
2. Long March-2F carrier rocket near launch pad

Jiuquan Satellite Launch Center, northwest China - May 28, 2022 (CCTV - No access Chinese mainland)
3. SOUNDBITE (Chinese) Deng Xiaojun, No.0 commander for Shenzhou-14 crewed space mission (partially overlaid with shots 4-5):
"We started preparing two rockets and two spacecraft for every launch mission when the space station was still under construction, and we call it 'rolling' launch. If the astronauts in space find themselves in an emergency and need to return immediately, we will activate the emergency rescue launch in the shortest period of time to bring them back."

++SHOTS OVERLAYING SOUNDBITE++
FILE: Jiuquan Satellite Launch Center, northwest China - Date Unknown (CCTV - No access Chinese mainland)
4. Long March-2F carrier rocket
5.Time-lapse footage of Long March-2F carrier rocket being transported to launch tower
++SHOTS OVERLAYING SOUNDBITE++
6. Various of Long March-2F carrier rocket near launch pad

Jiuquan Satellite Launch Center, northwest China - May 28, 2022 (CCTV - No access Chinese mainland)
7. SOUNDBITE (Chinese) Liu Feng, deputy chief designer, Long March-2F carrier rocket (starting with shot 6/ending with shot 8):
"After arriving here from Beijing, each rocket will be erected and go through relevant tests. Then it will enter the emergency standby state, and the previous standby rocket will be ready for the launch mission. The roles of the two rockets have been constantly shifting."

FILE: Jiuquan Satellite Launch Center, northwest China - June 17, 2021 (CCTV - No access Chinese mainland)
8. Various of Long March-2F carrier rocket carrying Shenzhou-12 blasting off

FILE: Jiuquan Satellite Launch Center, northwest China - Date Unknown (CCTV - No access Chinese mainland)
9. Various of Long March-2F carrier rocket being transported to launch tower

The Long March-2F carrier rocket, designed to launch China's Shenzhou crewed spacecraft, has been shown up in pairs at the launching site, with one on mission and another a backup, to better cope with emergencies during the space launch.

China's crewed spaceship Shenzhou-14, atop a Long March-2F carrier rocket, has been transferred to the launchpad at the Jiuquan Satellite Launch Center in northwest China on Sunday, according to the China Manned Space Engineering Office (CMSEO).

China has accomplished eight manned space missions since 2003, and all of them were launched from Jiuquan Satellite Launch Center, as it's home to the country's only plant eligible for conducting the final assembly and testing for the manned rockets.

The Long March-2F rocket is assembled, tested and transported in the same vertical posture as when it is launched - that's why a large plant is needed.

Behind the two doors of the plant are now the rocket poised for the upcoming Shenzhou-14 mission and another rocket expected to carry the Shenzhou-15 spacecraft.

Since China started to build its own space station, the rockets and the spacecraft for the manned mission are required to have emergency rescue capabilities to ensure the safety of astronauts, which means a backup rocket and spacecraft should be in place when there's an emergency.

"We started preparing two rockets and two spacecraft for every launch mission when the space station was still under construction, and we call it 'rolling' launch. If the astronauts in space find themselves in an emergency and need to return immediately, we will activate the emergency rescue launch in the shortest period of time to bring them back," said Deng Xiaojun, No.0 commander for Shenzhou-14 crewed space mission.

The "rolling" launch has become a regular operation since the Shenzhou-12 mission last year. The two rockets are on duty in turns to enable a safer mission.

"After arriving here from Beijing, each rocket will be erected and go through relevant tests. Then it will enter the emergency standby state, and the previous standby rocket will be ready for the launch mission. The roles of the two rockets have been constantly shifting," said Liu Feng, deputy chief designer of Long March-2F carrier rocket.