10 world's biggest and most amazing holes

Udachnaya Pipe, Russia

The Udachnaya Pipe is a dia­mond mine in Russia. The own­ers of the mine plan to cease its oper­a­tions in 2010 - in favor of under­ground min­ing. The mine was dis­cov­ered in 1955 and is over 600 meters deep.

Great Blue Hole, Belize

The Great Blue Hole is an under­wa­ter sink­hole off the coast of Belize. The hole is 1,000 feet across and 400 feet deep. It was formed as a lime­stone cave dur­ing the last iceage.

Monticello Dam, California

The Monticello Dam is a dam in Napa County, California, United States most not­ed for its large cir­cu­lar spill­way with a rate of 48,400 cubic feet per second.

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Pariah Burke

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