They fled the Nuba Mountains to escape fierce shelling and fighting that erupted in 2011 , the same year South Sudan gained its independence and became the newest country in the world .
More than 70,000 refugees live at Yida Refugee Camp in South Sudan .
refugees fled the Nuba Mountains to escape fierce shelling and fighting that erupted in 2011 , the same year South Sudan gained South Sudan 's independence and became the newest country in the world .
More than 70,000 refugees live at Yida Refugee Camp in South Sudan .