The crew currently onboard China's under-construction space station is preparing to return to Earth, having nearly completed their five-month mission. The three taikonauts have been carrying out various experiments, and ultimately working towards the completion of the space station. Their successful return to earth would mark the end of what's called the "technology verification phase" of the space station project. Their final tasks will include a series of checks to ensure their safe passage home. Our reporter You Yang has more.