The first explorers to descend to the deepest part of the ocean were Don Walsh and Jacques Piccard i

The first explorers to descend to the deepest part of the ocean were Don Walsh and Jacques Piccard in the bathyscaphe Trieste, January 23, 1960. 52 years later, James Cameron’s DEEPSEA CHALLENGER journeyed to the bottom of the Mariana Trench, nearly 7 miles below sea level.
Photograph courtesy U.S Navy