Our Vision

Poseidon Ascend is a performance physiology company, not a travel agency.

We don’t sell vacations. We provide a controlled, science-backed immersion into the human nervous system, using the ocean as our laboratory. Our experiences are designed for individuals who operate in high-stakes environments and understand that peak performance is not about motivation — it is about regulation.

Every protocol, from breathwork to in-water training, is grounded in measurable outcomes. We exist to give you a deeper understanding of your own physiology and a set of tools to control your state, manage stress, and expand your capabilities long after you leave the water.

The Difference

Three Pillars of Our Method

01

Physiology-First

We start with the science. Our methods are rooted in respiratory physiology, neuroscience, and measurable biomarkers like HRV and CO₂ tolerance.

02

Controlled Immersion

The ocean is not a backdrop; it is a tool. We use its pressures and demands to create a unique environment for accelerated learning and adaptation.

03

Measurable Outcomes

You leave with a new baseline. We track progress, provide personalized protocols, and ensure the skills you learn are transferable to your professional and personal life.

Founder & Head of Performance

Tavi Castro

Tavi Castro is a world-record-holding freediver, Aerospace Engineer, and the founder of Poseidon Ascend. With breath holds exceeding 7.5 minutes, dives to depths of 100 meters on a single breath, and three world records to his name, he has dedicated his life to exploring the upper limits of human potential.

His unique background in engineering provides a scientific, first-principles approach to breathwork and nervous system regulation. Tavi has coached elite athletes, special forces operators, and high-level executives to achieve peak performance under pressure. Known as “The Real Aquaman” for his viral underwater cinematography, he is also a passionate conservationist, collaborating with organizations like Sea Shepherd to protect the oceans he calls home.

“Every dive is a journey inward — beyond physical limits and into a deeper connection with nature.”

View Tavi's Full Bio

100m

Max Depth on Breath

7:30+

Minute Breath Hold

3x

World Records

B.Sc.

Aerospace Engineering

Head of Movement & Longevity

Yanita Yancheva

Yanita Yancheva is an elite fitness professional and entrepreneur specializing in functional movement, body composition, and longevity. Her approach elevates our retreats beyond in-water technique, focusing on the physical architecture that supports high performance.

She guides sessions designed to improve mobility, posture, and breath mechanics — essential for diving and equally important for a long, healthy life. Yanita’s expertise ensures that every guest leaves not just with new skills, but with a stronger, more resilient body.

World-Class Collaborators

Train with the Best in the World

We partner with the deepest and most accomplished freedivers in history. Our special guest instructors are not just athletes; they are pioneers who have shaped the sport and continue to push its boundaries.

Conservation Commitment

Protecting the Environment We Explore

True exploration requires responsible stewardship. We are proud to partner with and support Sea Shepherd, a global marine conservation organization dedicated to defending wildlife and safeguarding marine ecosystems.

A portion of every expedition fee is donated directly to Sea Shepherd, helping them patrol the seas, protect vulnerable species, and continue their critical advocacy work. By joining us, you become part of this mission.

Learn About Sea Shepherd

The Experiences

Explore Our Immersions

Baja California Retreat

A 7-day immersion into freediving, breathwork, and marine wildlife encounters in the Sea of Cortez.

Tulum Retreat

Explore the mystical cenotes of the Yucatan Peninsula while mastering advanced breathwork techniques.

Corporate Programs

Physiology-first training for executive teams, founders, and high-performance organizations.

100+

Guests Trained

15+

Expeditions Per Year

5-6

Max Guests Per Retreat

100%

Focus on Safety & Mastery

Contact

Discuss Your Goals

Reach Tavi directly to find the right experience for your objectives.

Email [email protected] WhatsApp Tavi

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