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Workers stand in a new addition to the massive underground deep drainage tunnel system in Mexico City, on March 10, 2012

Workers stand in a new addition to the massive underground deep drainage tunnel system in Mexico City, on March 10, 2012

tunnel vision / ricardo toma

tunnel vision / ricardo toma

Scenes From Underground, Part II - In Focus - The Atlantic

Scenes From Underground, Part II - In Focus - The Atlantic

Building ight rail tunnel

Building ight rail tunnel

sweden

sweden

Mobile, Ala. – Adams Street near the State Docks in Mobile, Ala. is flooded on Wednesday, Aug. 29, 2012. Hurricane Isaac has dumped more than five inches of rain on the Alabama coast and knocked out power to some residents, but it hasn't interrupted the everyday life of others.

Mobile, Ala. – Adams Street near the State Docks in Mobile, Ala. is flooded on Wednesday, Aug. 29, 2012. Hurricane Isaac has dumped more than five inches of rain on the Alabama coast and knocked out power to some residents, but it hasn't interrupted the everyday life of others.

Very low water in El Atazar's reservoir near El Berrueco in Madrid, on March 16, 2012.

Very low water in El Atazar's reservoir near El Berrueco in Madrid, on March 16, 2012.

Frozen Chicago: What The Windy City Looks Like Under Ice, Thanks To The Polar Vortex (PHOTOS)

LOOK: These Photos Of Chicago Under Ice Are Pretty Surreal

Frozen Chicago: What The Windy City Looks Like Under Ice, Thanks To The Polar Vortex (PHOTOS)

Tropical Islands, Krasnitz, Germany, 2008. Christoph Morlinghaus

Tropical Islands, Krasnitz, Germany, 2008. Christoph Morlinghaus

Ireland

Ireland

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