Elmer Fudd, I totally agree with Bob -- I really, really don't like being deep in Puget Sound on air or Nitrox; in fact, four years ago, I set a personal limit of 100 fsw because I'm just not at all happy below that. Helium makes a HUGE difference.
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They seem insipid. A bit of anxiety, keeps you alert, some narc, cool, wrong formula a ha to much. Boom. Get the gas.