Dr. Christopher Newhall of the U.S. Geological Survey joins Art Daag and Bellia Tubianosa of the Philippine Institute of Volcanology and Seismology as the three gather rock and soil samples from Mount Pinatubo in the aftermath of its eruption. The volcano, which came alive for the first time in over 600 years, forced the U.S. military to conduct Operation Fiery Vigil evacuation efforts during which over 20,000 evacuees will be removed from Clark Air Base, foreground, and Naval Station, Subic Bay