Featured Image: Picture of the South Portal entrance to Yucca Mountain. The large device to the left is the TBM that excavated the main tunnel which is called the Exploratory Studies Facility. The tunnel is 5 miles long and is U-shaped. Repository will be 1000 feet below the surface of the mountain and 1000 feet above the water table. CREDIT: Daniel Mayer SOURCE: Wikipedia Commons. (This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license).