Auguste Piccard (1884–1962), a Swiss physicist remembered for his balloon ascents into the stratosphere, along with his twin brother Jean Felix (d. 1963). In 1932, Auguste ascended to 55,500 ft (16,916 m). He ultimately made a total of twenty-seven balloon flights, setting a final record of 72,177 ft (23,000 m). From 1946 on, he focused on ocean research, making several notable dives with his son, Jacques Piccard, off the African and Italian coasts in a bathyscaphe of his own design. In 1960, his son Jacques Piccard, with U.S. Navy Lieutenant Donald Walsh, descended 35,800 ft (10,912 m) into the Mariana Trench, located in the Pacific Ocean, just east of the Mariana Islands near Japan.