"It's a huge, complex engineering project, " said Anastasia Chernova, a spokeswoman for the Sochi Department of Railway Construction.
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But she says although her battle with Chernova and Dobrynska is bound to be intense, she is determined to approach the Olympics as she would any other event.
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Ennis broke through at the 2009 World Championships when she claimed gold in Berlin but last year in Daegu, South Korea, she relinquished her title to Russia's Tatyana Chernova.