rebreatherHORIZON SCR MARES + training


rebreatherHorizon Mares. Discover the true world of silence.


The rebreathersemi-enclosed HORIZON MARES

Mares and rEvo have come together to create a unique semi-closed rebreatherlike no other. For divers looking for a machine that is easy to use, easy to dive, designed for all levels of divers and developed to offer the utmost safety.

Size and weight

- Height: 54 cm

- Width: 40 cm

- Depth: 22cm

- Unit weight: 12 kg (without regulator assembly)

- Complete weight of the non-deco version: 13.4 kg

- Full weight of the full deco version:


- Two scrubber cartridges, each containing 1 kg of CO2 absorbent that can be refilled by the user

- Two integrated weight pockets, each holding a maximum of 2.5kg of weightFully adjustable harness system, XS to XXL

- Safety gag strap on mouthpiece

- Two oxygen sensors

- Constant oxygen fraction delivered to the diver, adjustable during the dive

- Automatically reverts to full nitrox breathing in case of failure

- Remaining scrubber time calculated by the dive computer

- No tools required for preparation, use, cleaning

Limits of use

- Maximum recommended depth using mono as gas supply, no decompression: 30 m

- Maximum depth allowed in
using two bottles as a feed
in gas: 40 m

- ppO2 during use: minimum 0.22
bar, maximum 1.60 bar

- Water temperature: minimum 4 °C, maximum 34 °C

- Nitrox mix allowed:
minimum 30%, maximum 99%.

- Scrubber material
approved: Sofnolime 797

- Endurance of scrubber material as a function of temperature and metabolic oxygen consumption: calculated by the dive computer (i.e. at 15°C or higher, with medium/high oxygen consumption, duration is > 3 h)


- Three sets of redundant electronics, each with an individual battery system

- All battery systems can be charged from a single point

- High contrast dive computer display

- User-adaptable gradient factor decompression algorithm

- HUD with clear GOOD / FAIL indication

- Approved at 40m

Training rebreathersemi-enclosed Horizon

training rebreather Horizon. This machine that is rebreather allows you to dive in a really different way. With a rebreather training, you breathe a gas that is always optimized to help you manage decompression and whose recycling allows you to safely extend your dives to several hours. Without noise and bubbles, this training allows you to get as close as possible to the fauna that you do not disturb. The rebreather Horizon selected for your training is one of the most advanced machines on the market, offered by the manufacturer of the closed circuit rEvo on which we train also

The rebreather Horizon training allows you to learn, in the heart of the Parc National des Calanques in Marseille :

  • To manage your new sensations of ventilation and balance,
  • To prepare your machine and perform all the routine checks according to a rigorous check list,
  • To manipulate the control instruments,
  • to use one or two bottles on board,
  • To manage emergency situations,
  • To approach wildlife quietly in peace and security.

The training program rebreather semi-closed MARES leisure activities;

History and evolution of recyclers
Comparison of open, closed and semi-closed circuit recyclers
Practical mechanics of the system
Assembly and disassembly of the rebreather
Implementation and design
Scrubber Refill
System Maintenance
Procedures for decontaminating breathing loops
Examination of nitrox
Dalton's law (triangle)
Optimal mixture of nitrox
Oxygen monitoring
Gas preparation
Examples of dive planning
Gas physiology
Oxygen toxicity (O2)
Nitrogen absorption
Toxicity of carbon monoxide (CO2)
Gas consumption
Work on formulas and metabolic consumption
Oxygen (O2) metabolism calculations
Inspired Oxygen (O2) calculations (equation from rebreather)
Equivalent Air Depth (EAD)
Diving tables
Inspired Oxygen (O2) Chart
Equivalent air depth
Diving Computers
Adjustable mixture
Integrated Oxygen (O2)
PO2 monitoring devices
Loss of mouthpiece
Loss of battery or sensor
Rupture of the respiratory pocket
Open circuit rescue system
Hyperoxia Scenario
Hypoxia Scenario
The hypercapnia scenario
Maintenance of equipment after a problem
Diving and operational planning

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Pack rebreather+ training

Horizon + additional training / crossover 2 days, Horizon + additional training 3 days following preco 1D, Horizon + full training 4 days