Freediving is safe when it's done right and dangerous when it isn't — and the dividing line is almost always supervision. The single most important rule in the sport is simple: never freedive alone. This guide covers the safety basics every freediver learns; it's an overview, not a substitute for proper training with a certified instructor.
The buddy system: one up, one down
The golden rule of freediving is "one up, one down." One diver descends while the other stays at the surface, watching, and is ready to assist. The surface buddy follows the diver's return, meets them near the surface, and watches them for around 30 seconds after they breathe — the window where most problems happen. Solo freediving removes the one thing that makes a blackout survivable, which is why it's never recommended.
Blackout & LMC
The main risks in freediving are low-oxygen events near the surface:
- Shallow-water blackout — a loss of consciousness caused by low oxygen, usually in the last few metres of an ascent or at the surface. With a buddy right there it's recoverable; alone it's the leading cause of freediving fatalities.
- LMC (loss of motor control), sometimes called a "samba" — shaking or loss of coordination at the surface from low oxygen, a warning sign that you pushed too close to your limit.
Both are avoided by diving well within your limits, never hyperventilating, and always having a trained buddy.
Rescue basics
Freediving courses teach you to manage a buddy who blacks out: support the airway above water, remove their mask, and prompt them to breathe ("blow-tap-talk"). These are trained, hands-on skills — reading about them isn't enough, which is exactly why supervised training matters.
Train it properly
Every reputable course builds safety in from day one. Find a certified instructor in Anilao, and before you book, read how to choose and verify their credentials — current rescue training is one of the things to confirm.