narrator: mothes and geologist peter hal, ertions can kill and destroy.cuaons cause greaperscoc. what if they sound the alarm tuur not ally wi pplbelieve em what ife next time,the alarm before it really does? suddenly, after monitoring the mountain for five years, their theoretical problem has become alarmingly real. ( rumbling explosions echoing ) mothes: in september 1998, our existing seismic network on the volcano began to register a greater numb of fracture-type earthquakes beneath the volcano. narrator: the next august, tungurahua releases a column of steam thousands of feet in the air. the deadly vapor accompanies more earthquakes and sulfur emissions. it's time for the scientists to go public. on the tenth of september, we decided we had better call a yellow alert, which changed the way everybody looked at the volcano. narrator: soon, people could not only see but feel the danger. ( volcano rumbling ) the violent mountain throws out clouds of volcanic ash, suffocating crops and animals. voano rumb ) now, ordinary citizens could taste the peril lur