refactor under outdoorsing

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-format: rst
-categories: 
-toc: no
-...
-
-============
-SCUBA Diving
-============
----------------------------------------------
-Self Contained Underwater Breathing Apparatus
----------------------------------------------
-
-SCUBA stands for "Self-Contained Underwater Breathing Apparatus".
-One of the primary organization regulating recreational SCUBA diving is 
-PADI (the Professional Association of Diving Instructors). 
-
-Equipment
----------
-
-:BCD:   The buoyancy control device is basically an inflatable live vest 
-        that you can inflate using the regulator (or by mouth) to control
-        your buoyancy. Your buoyancy changes as you use up air (tank gets
-        lighter for same volume displaced), inhale/exhale, swim in water
-        of different temperature or salinity, or change depth: increased
-        pressure compresses any flexible air pockets, including the BCD
-        itself, neoprene foam, or a dry-suit.
-        Most BCDs have their own pressure hoses coming from the first stage
-        regulator that supply air.
-        Sometimes there is only one vent valve, which has to be at the
-        highest orientation or air will not vent out of the bladders.
-:Tank:  Most tanks are made of steel or aluminum and can store compressed
-        air of up to 3000psi. They are stored at pressure to prevent moisture
-        from leaking in. There is a valve built into the tank itself that
-        usually gets taken apart and repaired every two years. Tanks
-        can last for decades even with heavy use; they are pressure tested
-        for fatigue and leaks.
-:Regulator: The first-stage regulator is connected to the tank and steps
-            the pressure down to about 250psi above the surrounding/ambient
-            pressure. Hoses carry air at this mid-level pressure to the second
-            stage regulator/mouthpiece, which steps the pressure down to
-            about what is in your lungs. Depending on the regulator they can
-            be stiff (you have to suck a bit to get air, but then it rushes
-            in with force) or very natural feeling (air comes very smoothly
-            on inhalation and doesn't press into your lungs).
-:Alternate: These days almost everybody carries a second regulator mouthpiece
-            for emergencies. These are always on and ready to breath from,
-            but usually stiffer so they don't free-flow as often.
-:Dive Computer:
-        A dive computer monitors time and depth to give you an accurate picture
-        of how much excess nitrogen is in a diver's bloodstream. By 
-        continuously integrating they usually "give more time at depth" than
-        hand calculations using tables (which err towards safety).
-:Dry Suit:  A dry suit is a sealed and air tight, keeping the diver's skin dry.
-            Extra insulation is needed to give warmth underneath. Some dry
-            suits are made of compressed neoprene.
-            A dry suit has to be constantly adjusted with tank air just like
-            the BCD to maintain inflation and buoyancy.
-:Wet Suit:  Wet suits work on the principle of holding water against the skin:
-            a diver's body warms this water and stays cozy as long as water
-            flow is restricted enough. Even little bit too much flow through
-            wrist or ankle openings can be very cold.
-        
-
-Depths
-------
-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.
-
-With careful decompression stops and enriched compressed air (higher oxygen
-content) it's possible to reach depths of hundreds of meters. Sometimes
-commercial divers will dive for many hours using surface supplied air,
-then live at the surface in a compression chamber overnight between dives
-to stay at the same pressure [*]_.
-
-History
--------
-I'm pretty sure `Jacques Cousteau`_ invented the aqualung, which is the basis
-for modern diving, but I'll have to check.
-
-.. _Jacques Cousteau: /k/jacquescousteau/
-
-Flying
-------
-After a regular no-decompression dive, wait at least 12 
-hours before flying (or going to high altitude, eg over 300m).
-
-.. [*] Need a citation, heard this word of mouth