Medical & Safety

Mild, well-controlled asthma is often compatible with diving under DAN and UHMS guidelines. Here's what "well-controlled" actually means, and why medical clearance matters.

The bends happen when nitrogen dissolved in your tissues forms bubbles on ascent. Here's how supersaturation works, what exceeding bottom time actually risks, and why some hits are "undeserved".

Holding your breath while ascending can rupture lung tissue in as little as a metre of depth change. Here's the physics behind pulmonary barotrauma and why the oldest rule in diving still matters most.

Nitrogen narcosis makes divers feel drunk at depth, and it's the leading cause behind more diving errors than most divers realise. Here's what causes it, what it feels like, and how to manage it.

Ear problems are the leading cause of diving injuries, but nearly all are preventable. Here's how to equalise properly, which techniques to try, and when pain means it's time to end the dive.