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(im plō’ zh∂n) Collapse into a region of very low pressure; cavitation. The creation of such a region under water (as with the Hydrosein or Flexichoc) causes water to rush in with great force and the collision of the in-rushing water on itself generates a seismic shock wave. The out-rushing of water propelled by a bubble of high-pressure gas (as from an underwater explosion or from an air gun) leaves behind a region at the very low vapor pressure of water, into which the water subsequently collapses, resulting in the bubble effect (q.v.).