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| | RGBMdiving.com: Reduced Gradient Bubble Model: A Decompression Resource for the Scuba Diver |
 | | Serious diver training and certifying agencies, such as the National Association of Underwater Instructors, YMCA, and Professional Association of Diving Instructors, strong and vital today, organized in the late 1950s and 1960s. |
 | | Aristotle (384 BC), pupil of Plato, and tutor of Alexander, writes of diving bells used to recover treasure. |
 | | Detailed military accounts link to Xerxes who employed combat divers to recover treasure from sunken ships (519 BC), as chronicled by the Greek historian, Herodotus. |
| www.rgbmdiving.com /site/decohis.htm (834 words) |
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