Medical & Safety

Diving's rules exist because somebody learned them the hard way. Here's the medicine behind the ones with the most riding on them: equalising, ascent rates, narcosis and flying afterwards. None of it replaces a dive medical, but it will make the conversation with your doctor a better one.

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The other guides

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  • A class of student divers at the surface, kitted up, with the instructor signalling

    Learn to Dive

    Learning to dive starts in a pool, with an instructor and no assumption you've done this before.

  • Two scuba divers hovering mid-water under strong sun rays, reef fading into blue

    Dive Science

    Water bends light, swallows colour and carries sound too fast to place.

  • Dive kit laid out on a marina deck with cylinders, fins and BCDs, boat behind

    Gear Guides

    Marketing sheets say what a piece of kit does.

  • Red Sea reef with pink, red and yellow soft corals and orange anthias against blue water, Marsa Alam, Egypt

    Marine Life

    You'll spend most of your dives looking at animals that don't care you're there.