yells, men respond] [garay speaking spanish] [garay speaking spanish] [garay speaking spanish] [gonzalo cordova speaks spanish] [garay speaking spanish] [woman speaking spanish] [camera focus adjusting] [garay speaking spanish] [garay speaking spanish] [luis loraico speaking spanish] [garay speaking spanish] [woman speaking spanish] [garay speaking spanish] [garay speaking spanish] [luis loraico speaking spanish] [garay speaking spanish] [luis hidalgo okimura speaking spanish] [teacher speaking spanish] fernandez: an ngo that tracks mercury a mining has estimated 185 tons of mercury are released to the rivers and lakes of this region every year. and at the bottom of those rivers and lakes, there are naturally occurring bacteria that transform liquid elemental mercury and turn it into another form of mercury which is even more dangerous, which is methylmercury. fernandez: it's a type of mercury that's absorbed almost at 100% by living organisms. [student laughing] fernandez: plankton and plants that are contaminated with mercury then get eaten by one fish, and then another fish will eat that fis