On Dec. 28, 2015, rescue workers try to contact men trapped by a mine collapse in east China's Shandong province. Four survivors have now been raised to the surface after 36 days.
Guo Xulei/Xinhua News Agency/AP
Rescuers tend to a mine worker, in striped top, after he was pulled from an illegal gold mine Sunday in Benoni, outside Johannesburg, South Africa. Many of his colleagues remain below ground for fear of being arrested.
Alexander Joe/AFP/Getty Images