Students at Geza Gardonyi Primary School wear protective face masks as they return from a walk in their contaminated village in the aftermath of an industrial accident caused by the rupture of a toxic alumina sludge reservoir at a nearby plant, in Devecser, Hungary on November 24, 2010. Clean up crews are still working very much around the clock in the aftermath of an industrial accident on October 4, 2010 at the MAL plant in nearby Ajka, Hungary that sent a torrent of toxic red alumina sludge gushing through Devecser and several surrounding villages, killing ten, injuring hundreds and leaving several families homeless when the wall of a reservoir containing the hazardous material collapsed.