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Changes to the design, including a roof. russia is not famous for its efficiency so delivering all this on time will be a statement to the world. it's one reason why president vladimir putin is taking such a personal interest. demittory gregoria manages the speed skating arena and says putin's regular visits and direct oversight have made a dig difference. >> i'm not going to say why or how but it has, believe me. >> you're seeing things happen? >> yes. >> sochi's other challenge, overhauling the city's soviet era infrastructure. the skyline is a mess of kraens and partially completed building...

Guardrail, part of the bridge that leads to the city. it then burst into flames. for a while it closed off a busy part of what is the heart of the chinese capital. david mckin zi says police still don't know what caused the accident. >> russia is in a race to finish its olympic venues on time. the world is watching closely. putin is taking a very personal interest in had project, and that it has to be said is moving things along. last minute problems are mounting though. as fast as the price tag. now sochi is now the costliest olympic games on record, $51 billion and counting. here's phil blac...