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Anthony Feoutis, Freediving Instructor Trainer, author of The Depth Collector, descending in a Free Immersion dive along a rope in a streamlined position. He is wearing a wetsuit and mask, captured in a dramatic underwater scene with soft lighting and a focused perspective.

The Depth Collector 

A detailed black and white illustration of an octopus with intricately textured tentacles, blending into human-like fingers at the tips, set against a solid black background.

For freedivers who want more than depth.

Freediving training. One skill at a time.

Explore the books below

The Depth Collector – Book I freediving book depth collector book 1 apnea training breath hold techniques freediving fundamentals ocean diving performance guide
The Depth Collector – Book II freediving book depth collector book 2 advanced apnea training breath hold performance deep diving techniques freediver training guide
Master Hands-Free Equalization freediving equalization book BTV technique hands free equalization apnea training ear pressure equalization freediver training guide
Freediving Training Logbook freediving logbook apnea training tracker breath hold diving log depth tracking freediver progress journal diving training log
CO₂ Tolerance Training for Freediving freediving CO2 tolerance training book apnea breath hold training carbon dioxide adaptation freediving performance training guide
Mental Control for Freedivers freediving mental training book apnea mindset breath hold psychology fear control freediving performance mental control guide
The Science of Strength for Freediving freediving strength training book apnea physical preparation dry training freediver strength conditioning underwater performance
Freediving Safety Manual freediving safety manual book apnea diving safety guide barotrauma prevention freediving risks emergency procedures training

A free deep dive into the mind of a freediver.

Train your mind to stay calm, focused, and in control underwater.

No spam. Just practical freediving training.

mental hacks ebook (148 x 210 mm) (3).png

The 8 Foundational Pillars
of Freediving Training

The Heart of the Depth Collector Series

I’m a freediving instructor trainer who has spent over a decade obsessed with one thing: how the human body adapts to depth.​

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Together with my wife, I co-founded VD Freediving Taiwan, where we’ve guided divers of all levels, not just to explore the ocean, but to discover what they’re capable of.

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From this work, a simple framework emerged:​

The 8 Foundational Pillars of Freediving Training.

Covering CO₂ tolerance, hypoxia, technique, adaptation, mental training, physical preparation, nutrition, and recovery.

​

​A system that has helped countless freedivers become stronger, safer, more in control, and dive deeper.​

​

Not about training harder.

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About training smarter.

Freediving instructor guiding a student along a depth line during open water training

Precision. Control. Depth.

Trusted by professionals

"This book is a masterpiece."

Juan M. Valdivia Valdivia
Neurological Surgeon
AIDA Medical & Science Committee

Continue your training

Get practical tools, insights, and updates from The Depth Collector.

No spam. Just practical freediving training.

Click here to download

© 2026 The Depth Collector.

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