"It's a huge, complex engineering project, " said Anastasia Chernova, a spokeswoman for the Sochi Department of Railway Construction.

WSJ: Menu

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.

CNN: STORY HIGHLIGHTS

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.

CNN: STORY HIGHLIGHTS

Ennis's main competition at the Gotzis multi-events meeting, which is part of the IAAF World Combined Events Challenge, is likely to come from the Ukraine's reigning Olympic champion Nataliya Dobrynska and World Indoor pentathlon champion Tatyana Chernova of Russia.

BBC: Jessica Ennis to break heptathlon record - Sotherton