The document discusses the dangers of diving deep in the Mariana Trench, including lack of oxygen, high water pressure, and risks of decompression sickness when ascending or descending too quickly. It outlines symptoms of decompression sickness like joint pain, confusion, and coughing and explains recompression treatment. The text also notes how diving deeply affects the respiratory, muscular and skeletal systems through water pressure, temperature, and lack of oxygen.
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