Twenty people are killed in Fremont, Nebraska, when the Pathfinder Hotel explodes on the cold Saturday morning of January 10, 1976. An investigation into the tragic gas leak leads underground to where gas lines supply this iconic building in America's heartland.

Tragedy struck Puerto Rico in November 1996 when a propane gas explosion collapsed a six-story tower with the popular Humberto Vidal shoe store on the first floor. The disaster killed 33 people and wounded more than 80 others.