As search and rescue operations continue in the Nepal-Tibet disaster, families on both sides of the border are anxiously awaiting news of their loved ones. Deborah Wong spoke to Guan Dao Xuan, a 38-year-old Chinese national who says he has not heard from his wife. She had been working for a Chinese infrastructure construction company on the Nepal side of the border. Mr Guan arrived in Tibet on Thursday, in a desperate search for answers.