Dive Science
Water bends light, swallows colour and carries sound too fast to place. Most of what feels strange underwater is physics doing what it does everywhere, and knowing why makes you a calmer diver. Diving from Johannesburg? Start with the altitude guide, because it changes your limits.
Newest first
Peeing in a Wetsuit
The Reflex You Can't Train
Wrecked After Two Dives
Where Tiredness Starts
Air Gone First
Why You Surface Before Everyone
How Long a Tank Lasts
Work Out Your Number
Heat Loss Underwater
Why 24°C Feels Cold
Sound Underwater
Why Direction Disappears
Underwater Colour
Why Red Goes First
The Oxygen Tank Myth
Why Divers Breathe Air
Nitrox
More Bottom Time, Less Depth
Altitude Diving
Why Joburg Changes Your Limits
Underwater Vision
Bigger, Closer, Then Farther
Peeing in a Wetsuit
The Reflex You Can't Train
Wrecked After Two Dives
Where Tiredness Starts
Air Gone First
Why You Surface Before Everyone
How Long a Tank Lasts
Work Out Your Number
Heat Loss Underwater
Why 24°C Feels Cold
Sound Underwater
Why Direction Disappears
Underwater Colour
Why Red Goes First
The Oxygen Tank Myth
Why Divers Breathe Air
Nitrox
More Bottom Time, Less Depth
Altitude Diving
Why Joburg Changes Your Limits
Underwater Vision
Bigger, Closer, Then Farther
Quickest reads first
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The other guides
All guides
Learn to Dive
Learning to dive starts in a pool, with an instructor and no assumption you've done this before.
Medical & Safety
Diving's rules exist because somebody learned them the hard way.
Gear Guides
Marketing sheets say what a piece of kit does.
Marine Life
You'll spend most of your dives looking at animals that don't care you're there.
