A hole so big that aircraft are not allowed to fly over it. Why? The suction is too dangerous. A hole more than 500m deep and wider than 1 km and visible from a satellite.    

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Two white tiger cubs find an unusual surrogate mum...Anjana the chimpanzee
When two white tiger cubs were born during a hurricane they had to be separated from their mother after their sanctuary flooded. However they have since found an unlikely surrogate mother in chimpanzee Anjana, who has taken on the role of caring for the cubs. These adorable images will melt even the most cynical of hearts. The two-year-old chimp has been helping keeper China York care for the 21-day-old cubs at The Institute of Greatly Endangered and Rare... Dr Bhagavan added: 'China's role means that she is care giver to hundreds of animals when they are born. 'Anjana has been with China, side by side, ever since she was born and has joined her in caring and raising baby animals. 'So she helped her and acted as a surrogate mother...

Read more: Two white tiger cubs find an unusual surrogate mum...Anjana the chimpanzee