Christa Larwood finds out how trips to see Santa are changing as we prepare to celebrate Christmas in a pandemic. We head to Mount Everest, now closed to climbers, to find out how its famous sherpas are coping with the loss of work. Amanda Ruggeri is in China to look at some of the high-tech solutions to fix crumbling sections of the Great Wall. And we catch up with the couples separated by closed borders, but hoping to be reunited for Christmas.