Who is the first man visited Maryanna trench?

The first man to reach the Mariana Trench was Jacques Piccard, who, along with U.S. Navy Lieutenant Don Walsh, descended to the bottom of the trench in the bathyscaphe Trieste on January 23, 1960. They reached a depth of about 36,000 feet (over 10,900 meters) in the Challenger Deep, the deepest known point in the ocean. Their historic dive provided valuable insights into the extreme conditions and unique ecosystems of the deep sea.