So seriously are the authorities taking this threat to the historic stadium that they are launching an "anti-urine" patrol. An eight-man squad will patrol the corridors of the stands - which can hold 220,000 spectators - and forcibly guide the fans towards the lavatories. Mr Cardoso said: "When there are big games it can get pretty disgusting here with a really horrible smell. There is a huge volume of this liquid. If we don't do something about it the very structure of the Maracana could be destroyed."