Over-under view at the Blue Element platform — freedivers at the surface and finning below, Soufrière Bay, Dominica

Freediving instructor & AIDA Master · Soufrière Bay, Dominica

Calm is taught,
not forced.

From a first held breath to competition depth — courses, depth coaching and camps built on relaxation, efficient technique and a calm nervous system. Not pushing.

Photograph · Allie Reilly
Master
AIDA Instructor rating
250+
Students taught
5
Countries coached in
Allyr
Year-round in Dominica
I · The approach

Teach the nervous system,
not just the dive.

As an AIDA Master Instructor, Harry has certified 120+ students — from first breath-holds to competition depth. The method is the same calm that defines his own diving: relaxation first, efficient technique second, depth as the result — never the goal.

  • Relaxation and breath-up — where every dive is actually won
  • Equalisation that scales with depth — Frenzel, then mouthfill
  • Streamlined technique and efficient finning — or none at all
  • Safety, rescue and the mental side of going deep, calmly
Harry McCahill floating on his back at the surface, breathing up before a dive The breath-up — where every dive is won Allie Reilly
II · What you can train

The AIDA ladder —
beginner → instructor.

Full AIDA certification pathway, taught year-round in Dominica. Start with your first breath-hold or arrive with depth already and refine it — every course is run in small numbers, at your pace.

AIDA 1Discover
A one-day introduction — breathing, relaxation and your first breath-hold dives in shallow, confined water. No experience needed.
to ~10m
AIDA 2Foundation
The complete foundation — relaxation, equalisation, finning technique, buddy safety and rescue. The real start of depth freediving.
to ~20m
AIDA 3Advanced
Free immersion, the first mouthfill, refined technique and longer dives — building the toolkit to keep descending comfortably.
to ~30m
AIDA 4Master
Advanced equalisation, packing, and the calm of real depth — for divers committing to the deep end of the sport.
to ~40m
InstructorTeach
For divers ready to teach — instructor development and crossover, mentored by a Master Instructor. By application.
Pro
III · 1:1 Coaching

Coaching built
around you.

Beyond the set courses, Harry takes on a small number of divers for ongoing one-to-one coaching — your technique, your goals, your timeline. It starts with a discovery call to understand where you are and where you want to get to.

  • A plan shaped around your current depth and goals
  • Video review, dive analysis and personal feedback
  • Dryland support and breath-work between sessions
  • Competition prep and dive planning when you're ready
Two freedivers on the surface beside the line in Soufrière Bay, Dominica One-to-one, by the line Allie Reilly
IV · Depth camps
Freedivers at a Blue Element depth camp gathered at the surface platform, lush Dominica coastline behind, fins below the waterline Depth camp at Blue Element with Johnny Sunnex Daan Verhoeven

Regular depth camps
in Dominica.

Several times a year, Harry runs small-group depth camps in Soufrière Bay — one of the world's premier depth-training locations. No waves, no current, no boat ride — just deep, warm, sheltered water a few fin-kicks from shore.

  • WhereSoufrière Bay, Dominica — sheltered, volcanic, deep right off the shore
  • WhoAIDA 3+ divers and competitors working on depth, in small groups
  • WaterWarm and still year-round · over 100 m within swimming distance
  • CoachingDaily coached line sessions, video review, dive planning and safety
V · Dates & calendar

When we dive.

Private courses and coaching run year-round in Dominica — booked around your travel. Group depth camps are scheduled several times a year and released seasonally.

Request upcoming dates
VI · Around the world

One bay at home,
many waters abroad.

Dominica is home — but the work has taken Harry to freediving's great depth destinations, coaching and diving across four more countries.

Home base
Dominica
Soufrière Bay — year-round courses, coaching and depth camps.
Caribbean
Mexico
Baja California
The Sea of Cortez — deep, blue and warm on the Pacific side.
Mexico
Cenotes of the Yucatán
Still, glassy freshwater caverns — silent depth in the jungle.
Indian Ocean
Maldives
Atoll water — clear, warm and endless blue below.
Europe
France
Coaching and diving in the Mediterranean and beyond.
Europe
Greece
Calm Aegean depth — a heartland of the sport.
VII · Who I coach

From first breath
to competition depth.

120+ divers have trained with Harry — and the same calm method scales from someone who has never held their breath underwater to athletes chasing national records.

First breath
Complete beginners
Never dived on a single breath before? Start here — calm, unhurried and safe.
Recreational
Club & ocean divers
Build confidence, depth and technique for the diving you already love.
Performance
Competitive athletes
Depth coaching, dive planning and competition prep — to national level and beyond.
Comp prep
Pro
Instructor candidates
Mentoring for divers ready to teach, toward AIDA instructor ratings.
VIII · In their words

What it feels
like to train.

A few words from divers who have trained with Harry — from a first held breath to competition depth.

I went from nervous on the surface to calm at thirty metres in four days. Harry never once pushed — he just made the depth feel like the safest place to be.
Sarah · AIDA 2 · United Kingdom
The calmest, most patient coaching I have had. Every session ended with me wanting to go slower, not deeper — and the depth came anyway.
Marco · Club diver · Italy
Harry rebuilt my dive from the breath-up down. Two national-record attempts later, the difference is all in the relaxation he taught me.
Elise · Competitor · France
My first time holding my breath underwater, and I never felt rushed or unsafe. I left the course wanting to make this a part of my life.
Tom · First course · Australia

Start your training

Learn to let go.

Take your first course, deepen an existing one, or join a depth camp in Dominica. Tell me where you are and where you want to get to.

Get in touch See the records