A breath you
can feel.
Some of the gas stays in the loop. CO₂ absorption helps warm and humidify it — a difference you can feel compared with dry open-circuit gas.
HORIZON
Fewer bubbles.
More ocean.
A new perspective on life
beneath the surface.
MARES HORIZON / SEMI-CLOSED REBREATHER
A different breath.
A new horizon.
Slow down. Look around. Discover a new way to dive with Mares Horizon — an electronically controlled semi-closed rebreather that recirculates part of your exhaled gas.
12 kg
Weight of the unit alone1
2 × 1 kg
Two CO₂ absorbent canisters
Nitrox
Standard cylinders. New possibilities.
THOUGHTFULLY ENGINEERED
Considered.
Down to your
every breath.
Two scrubbers. One continuous loop. Two axial canisters in series remove CO₂ from your exhaled gas.
Beneath the surface, mechanics and electronics work together. The system monitors oxygen in the loop and controls the nitrox supply.
Key information in one place. A 2.8-inch colour display is complemented by a HUD light indicator in your field of vision.
See how the scrubbers, their lids and the unit body fit together. This Mares product animation reveals the layout from the inside.
Scroll to look inside
BECOME PART OF THE OCEAN
Everything else
can wait.
Fewer bubbles released. Warm, moist breathing gas. More freedom to take in the world around you.
Start with one diveDESIGNED FOR YOUR NEXT ADVENTURE
A big change.
A natural feeling.
A breath you
Packed.
Ready to explore.
A compact body and adjustable harness. Horizon uses standard nitrox cylinders carried separately from the unit.
Technology.
And you.
Horizon opens a new path in diving. With an instructor, you will develop good habits, learn to prepare the unit and become confident using the loop.
YOUR JOURNEY WITH HORIZON
Go beyond reading.
Experience it.
A first breath to try it out. Or the start of a new chapter.
Choose where your journey begins.
FIRST ENCOUNTER
Try dive
SSI Try SCR
Discover the feeling of a semi-closed rebreather on a try dive with an instructor.
Book a try diveA NEW SKILL
A new horizon
SSI SCR Diving
Learn to dive with Horizon on no-decompression dives.
Explore the courseTHE NEXT CHAPTER
Go further
SSI SCR Extended Range
Further training for decompression dives with Horizon to 40 metres.
Explore Extended RangeSee each course for prerequisites, scope and dates. Dive limits depend on your certification, unit configuration and breathing gas.