The Mariana Trench, located off the coast of Guam, is the deepest known place on earth. At approximately 36,000 feet deep at its deepest point, the trench could easily house Mount Everest, with over a mile of depth to spare.
University of New Hampshire scientists have not let these measurements prevent them from exploring the region. On the contrary, researchers have mapped the entirety of the trench - 400,000 square feet, according to a recent press release - and discovered four "bridges." Unprecedented depth measurements were recorded as well.