As man presses deeper into the world's lakes and oceans,he must turn to different technologies that allow longer stays at these depths.To meet this challenge,the obvious choice is one-atmosphere diving systems such as hard diving suits or sub-mersibles.Many such systems have been developed over the years,but recent technological advances have made these vehicles more reliable and practical.Because the vehicles are proving themselves dependable for both research and industrial applications,more and more designers are going to the drawing board.
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