Who entered the Mariana Trench?

At noon on Monday, local time, (10 p.m. Sunday ET) James Cameron's "vertical torpedo" sub broke the surface of the western Pacific, carrying the National Geographic explorer and filmmaker back from the Mariana Trench's Challenger Deep—Earth's deepest, and perhaps most alien, realm. read more

If you are asking who went to the Mariana Trench then my answer would be: Don Walsh and Jacques Piccard in 1960 with the help of Bathyscaphe Trieste Submarine which was designed by Auguste Piccard, father of Jacques Piccard. read more

The Mariana Trench or Marianas Trench is the deepest part of the world's oceans. It is located in the western Pacific Ocean, an average of 200 kilometres (124 mi) to the east of the Mariana Islands, in the Western Pacific east of Philippines. read more

The greatest depths are reached in Challenger Deep, a smaller steep-walled valley on the floor of the main trench southwest of Guam. The Mariana Trench, which is situated within the territories of the U.S. dependencies of the Northern Mariana Islands and Guam, was designated a U.S. national monument in 2009. read more