Last updated at 13:01

Olympic rings at Channel Tunnel entrance in France

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Check out how the rings were put up

A giant set of Olympic rings has been unveiled at the entrance to the Channel Tunnel in France.

Their unveiling marks "20/12 Day" - that's 20 December - looking ahead to the Olympics in 2012.

The rings are 9.4m wide and 4.6m high and fixed to the wall of the tunnel near Calais, in northern France.

The rings were assembled over two nights by five rock climbers - check out the clip to see them in action!