It's on display at the Museum of Science and Industry in Chicago. Meanwhile, Auguste Piccard's interests had turned from outer space to inner space. By 1937, he'd designed a new gondola to keep pressure out rather than in, and called it the bathyscaphe Trieste. In 1948, he took Trieste into the ocean. The bathyscaphe can be thought of as an underwater balloon that uses gasoline for its lift.
Gasoline is lighter than water, while hydrogen and helium are lighter than air.
He had first thought of the pressurized gondola for deep sea exploration while in school, but balloons were in vogue in the 1930's, and the opportunity to explore upward came first. Auguste was joined by his son, Jacques Piccard, and together they made over 100 dives, the deepest of which was two miles into the ocean depths. Don Walsh descended to 7 miles beneath the Pacific, in the Mariana Trench near Guam, the deepest place in the ocean. Jacques Piccard, today 76 years old, continues to pursue the oceanographic work he began with this father, Auguste. He works from his own laboratory on Lake Geneva, Switzerland.