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SCUBA Diving
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SCUBA stands for "Self-Contained Underwater Breathing Aparatus".
The primary organization regulating SCUBA diving is PADI (the
Professional Association of Diving Instructors) 

Safety
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Depths
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A PADI Open Water Diving course gives a recommended limit of 20m/60ft.
A "deep dive adventure course" gives a recommended limit of 30m/100ft,
and additional experience gives a limit of 40m/130ft.

Flying
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After a regular no-decompression dive, wait at least 12 
hours before flying or going to high altitude.