"the Pond in the big disaster in Brazil had a problem with the drainage and control systems, according to a report by the German consultants took up in August last year."
"The German company Tüv Süd recommended a number of measures to improve safety at the dam, but felt in the end that it barely reached the minimum requirements."
"In the pond's drainage channels, found the cracks, which are documented in the report, and the company recommended that a new oversight system would be installed to detect movements in the surrounding ground."
"Gruvdriftsbolaget Vale said in a statement that the recommendations were followed and describes the inspection as a routine. Five people from the Vale and the Tüv Süd, who has been arrested by the brazilian police was released on free foot on Tuesday."
"the Pond contained millions of tons of mining waste, as at the downfall of the January 25, pushed forward in a tidal wave and covered the surrounding landscape in mud and sludge. 134 people are confirmed dead and another 199 missing yet."