The above picture puts the amazing transformation into perspective.
From National Journal:
In this image, a mix of visible and near-infrared light, vegetation is red, snow white, buildings grey, and the ocean dark blue. The circular area on the shoreline at bottom of the image is the Sochi Olympic Park Coastal Cluster. The cluster houses the Bolshoy Ice Dome, which held the Opening Ceremony and skating competitions. The Games’ alpine events take place in the Mountain Cluster, located in a snow-capped valley at the top right of the photo.
Here’s a closer look at the terrain:
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