Auguste Piccard was a Swiss physicist whose work connected two extreme environments: the thin atmosphere of the stratosphere and the crushing pressure of the deep ocean.
Piccard developed a sealed spherical gondola for high-altitude balloon flights, recognizing that human survival at extreme altitude required a pressurized cabin rather than ordinary open-basket ballooning.
In 1931 Piccard and Paul Kipfer ascended in the FNRS balloon to more than 15,000 meters, becoming the first people to enter the stratosphere in a pressurized capsule.
A later flight in 1932 went higher. These ascents gave Piccard direct engineering experience with pressure vessels, life support, scientific instruments, and buoyant vehicles.
Piccard then reversed the problem. Instead of keeping low atmospheric pressure outside a cabin, a deep-ocean vehicle had to keep enormous water pressure outside a crew sphere.
He developed the bathyscaphe concept beginning before World War II. A pressure sphere for the crew hung beneath a large gasoline-filled float whose liquid buoyancy was much less compressible than air.
The FNRS-2 tested the concept after the war. Unlike a tethered bathysphere, the bathyscaphe carried batteries, ballast, and limited propulsion, allowing it to operate as a self-contained vehicle.
Piccard later worked in Italy on Trieste, launched in 1953. He and his son Jacques made an early trial dive together.
Trieste was eventually purchased by the U.S. Navy and, after modification, carried Jacques Piccard and Don Walsh to Challenger Deep in 1960.
For TransitSatellite, Auguste Piccard’s importance is the transferable engineering concept: pressure-resistant human cabins and buoyancy systems were adapted from upward exploration into downward exploration.