The term ground zero describes the point on the Earth's surface closest to a detonation.In the case of an explosion above the ground, ground zero refers to the point on the ground directly below the detonation.
The term has often been associated with nuclear explosions and other large bombs, but is also used in relation to earthquakes, epidemics, and other disasters to mark the point of the most severe damage or destruction. The term is often re-used for disasters that have a geographic or conceptual epicenter.
Ground Zero is also a term used in geocaching, explaining where a cache is placed, once you arrive to the listed coordinates, you are now at GROUND ZERO!
This is a series of caches all being letterboxes, none of the hides are tough, just look in the obvious locations. Some of the micro sized containers, do not contain an ink pad, so please bring your own if you choose to stamp. Do not take the stamp or ink pad, they must stay in the container.