glencore says it has improved security since the accident, including the construction of this 43 km wall. it's part of the company's $8 billion investment in the drc. but we've discovered artisanal miners have been climbing over the wall. in fact, one died in an accident on glencore�*s site ten days ago. there have been other problems with tesla's supplier. these are pictures from local tv, reporting a leak of sulphuric acid from a glencore mine. local people say it poisoned the river and surrounding farmland. we have a case at kcc which is a glencore mine. there was a lot of acid