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Gustave Eiffel (born Dec. 15, 1832, Dijon, France—died Dec. 28, 1923, Paris) was a French civil engineer, entrepreneur, inventor, meteorologist, and aerodynamics researcher, renowned for the tower in Paris that bears his name. What Is a Compressed-Air Caisson? A compressed-air caisson (also called a pneumatic caisson) is a watertight, bottomless retaining structure sealed at the top and filled with pressurized air. It is used in civil engineering to provide a dry underground working environment for...