It's the last time the two chemists are seen alive.
Black ash rockets two miles high as incandescent rocks pummel the caldera.
Six scientists and three local hikers killed in the blast. On the volcano's cone, Williams takes a rock to the head. The bodies of the three hikers from Pasto are discovered farther down the cone. Traces of the bodies of Geoff Brown and Fernando Cuenca, as well as the divided corpse of Carlos Trujillo, are recovered on the crater's west side.