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Some weird looking constructs have been placed on the pavements to match the Calatrava's atchitecture of the Olympic Stadium constructions.
Some say they are somekind of thermal control constructions that somehow emmit heat in winter (?!) and get cooler in summer (?!) but if you ask me i just can't see it!
The cache is a nano with only a log book and the declaration. It's not magnetic and hidden rather well!
Please place it exactly as you found it!