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Â鶹Éç South America correspondent Katy Watson on the collapse of the Brazilian dam. More than a week since the collapse of a dam owned by Brazilian mining company Vale, the death toll now stands at 157 with 182 people still missing. Those who survived are trying to piece together what happened to their loved ones - and understand how this could have been allowed to happen. In this week's Reporter's Notebook our South America correspondent Katy Watson gives us her impressions from the site of the disaster in south-eastern Brazil.