As you hike or run rim to rim, you see can see at times pipes and other indications that there is a pipeline buried under the North Kaibab and other trails. This is the trans-canyon pipeline which is the lifeblood for the South Rim and other locations along the way that supplies the water for your adventure. There is significant history behind the creation of this pipeline and several people even lost their lives during construction. As you travel rim to rim you should observe and know what once took place on the trails you travel including a massive 1966 flood, the most destructive event to the corridor inner canyon in recorded history.