>Of the various liquids chosen as incompressible fillers, I hereby do NOT >recommend a choice that Cousteau and Picard made once! They dived in a >`bathyscaphe', which is a hollow steel ball with a float. The float needed to >be filled with something incompressible, so they chose petrol (= gasoline)!!! >OK, it worked. The purpose of the gasoline was not as an imcompressible fluid, but as an easily obtainable lighter-than-water gas to float the bathyscape, which operated exactly as a lighter-than-air ballon, only underwater. In short, the gas was acting in water as helium/hydrogen in air. The designers doubtlessly felt the flammabililty would be of little problem thousands of feet below the surface; and that the pollution aspects (not that anyone gave a damn in those days) were justified by the scientific value of the missions.
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