Blues clues: Researchers were flabbergasted over the discovery of the Taam ja', a blue hole in Mexico that measures a whopping 400-feet deep, making it the second largest in the world.
Surprise discovery of world s 2nd deepest blue hole could provide window into Earth s history livescience.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from livescience.com Daily Mail and Mail on Sunday newspapers.
A sinkhole is a hole in the earth's surface caused by the erosion of the ground layer beneath, according to the United Nations Platform for Space-based Information for Disaster Management and Emergency Response (UN-SPIDER). This hole grows over time and can have a diameter ranging from one to 600 me