Only three people have been to the deepest part of the earth, and more than 3,000 people have been to the highest part of the earth. The deepest part of the Mariana Trench is called the Challenger Deep, which extends approximately 36,000 feet below the surface of the ocean. Only three people have visited this area, and film director James Cameron is one of them. The highest place on earth is the summit of Mount Everest, and there are about 3100 tourists among climbers. Unfortunately, more than 220 climbers died while trying to reach the summit.