In 2010, epic earthquakes all over the planet delivered one of the worst annual death tolls ever recorded. The deadliest strike was in Haiti, where a quake just southwest of the capital, Port-au-Prince, killed more than 200,000, reducing homes, hospitals, schools, and the presidential palace to rubble. But barely a month later, Chile was struck by a quake 100 times more powerful, unleashing a tsunami that put the entire Pacific coast on high alert. NOVA follows a team of U.S. geologists, capturing exclusive footage as they enter Haiti in the immediate aftermath of the tragedy; then NOVA visits a coastal town devastated by the Chilean tsunami, where geologists battle aftershocks to measure the displacement caused by the earthquake. Could their work, and the work of geologists at earthquake hot-spots around the U.S., one day lead to a breakthrough in predicting quakes before they happen? It is a race against time in the hunt for crucial evidence that will help determine exactly what is happening deep underground--and what the risks are of a new killer quake.