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 bleed seawater.

Freediving training. One skill at a time.

The Depth Collector – Book I
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The Depth Collector – Book II
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Master Hands-Free Equalization
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Freediving Training Logbook
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CO₂ Tolerance Training for Freediving
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Mental Control for Freedivers
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The Science of Strength for Freediving
freediving strength training book apnea physical preparation dry training freediver strength conditioning underwater performance

Freediving Safety Manual
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A free deep dive into the mind of a freediver.

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

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No spam. Just practical freediving training.

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The 8 Foundational Pillars of Freediving Training

The Heart of the Depth Collector Series

I’m a freediving instructor trainer. For over a decade, I’ve been obsessed with one thing: how the human body adapts to depth.

At this point, I sometimes feel like I’m bleeding seawater.

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.

From this work came a simple framework:

The 8 Foundational Pillars of Freediving Training.

A system that has helped countless freedivers become stronger, dive deeper, stay safer, and move with more control

Not about training harder.

About training smarter.

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

Juan M. Valdivia Valdivia, Neurological Surgeon and AIDA Medical & Science Committee Member

"This book is a Masterpiece"

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