Experience the Silence of Rebreather Diving
What is the Mares Horizon SCR
The Mares Horizon is a Semi-Closed Rebreather (SCR) designed for simplicity: easy to set up, transport, dive, and maintain. Its internal components are easily accessible, and the gas supply comes from one or two off-board cylinders (standard dive center tanks), giving an experience similar to sidemount diving.
Who is the Horizon SCR For
From marine life enthusiasts to underwater photographers, the Horizon is built for divers ready to go beyond open-circuit.
Recreational Divers
Observe marine life discreetly with a rebreather system supported by most dive destinations that provide nitrox. Enjoy extended bottom times with significantly fewer bubbles and minimal noise.
Photographers and Videographers
Capture natural marine behaviours without the disturbance of open-circuit bubbles. The Horizon gives you longer bottom time up to 30m or 40m depth, letting you focus on getting the perfect shot.
Entry to Rebreather Diving
If you are considering rebreather diving but want a lightweight, easy-to-use system, the Horizon is the ideal entry point. Simple setup, intuitive controls, and minimal maintenance make it accessible for divers ready to take the next step.
Advantages of Horizon SCR
Extended Dive Time
The Horizon acts as a nitrox extender, giving you significantly longer bottom time compared to open-circuit diving. Spend more time observing marine life and less time worrying about air consumption.
Lightweight and Travel-Friendly
At just 12kg empty, the Horizon does not require dedicated cylinders or weights. Combined with one regulator set (1.4kg), the total travel weight comes in under 23kg. Just use standard nitrox cylinders available at any dive destination.
Silent Diving Experience
Rebreather diving produces significantly fewer bubbles and less noise than open-circuit systems. Get closer to marine life, observe natural behaviours, and capture stunning photographs and videos without disturbing the underwater environment.
Fail-Safe and Intuitive
The Horizon features fail-safe gas operation, a built-in Bail-Out Valve (BOV) for emergency open-circuit breathing, and an intuitive Dive Controller interface. It creates a natural diving position and is easy to assemble and prepare for every dive.
How the Horizon SCR Works
Understanding the technology behind silent, extended-range diving.
Variable Flow SCR
The Mares Horizon is an active SCR with variable flow rates that maintain the desired fraction of oxygen in the breathing loop. The diver selects the nitrox mix for a particular dive and sets it in the computer. To maintain a constant loop FO2, the unit adjusts its flow rate between 5 and 30 litres per minute depending on the diver's metabolic rate.
A minimum flow rate of 5 l/min is maintained via the orifice at all times. When the oxygen fraction drops below the set point, the Electronic Addition Valve (EAV) opens and injects fresh nitrox until the fraction returns to the set point.
Depth and Time Limits
The Horizon supports diving within no-decompression limits or decompression dives up to a maximum depth of 40 metres. Two different gas mixes can be used to accelerate decompression: bottom gas for the descent and bottom phase, and decompression gas for the ascent phase. Both gases must have a minimum oxygen content of 30% and a maximum of 100%.
The Dive Controller
The Mares Horizon Dive Controller is a high-end, reliable dive computer that also configures and executes dives with the variable flow SCR. It allows the user to enter breathing gas data and define oxygen fraction setpoints to maintain during the dive.
Alarms and Warnings
A warning is issued when any dive parameter is outside its expected operating range, in situations where the diver's life is not in immediate danger. An alarm is displayed if a life-threatening situation occurs, requiring the diver to take immediate action.
The Bail-Out Valve (BOV)
If any problem arises with the Horizon, the diver can switch to the BOV. The Bail-Out Valve closes the breathing loop while automatically switching to a built-in second stage regulator, allowing the diver to breathe open-circuit without removing the loop from the mouth. The BOV uses the same gas that supplies the rest of the unit.
Scrubber: Absorbing CO2
The scrubber material removes carbon dioxide from exhaled breathing gas. The Mares Horizon features a unique dual-scrubber system with two canisters mounted in sequence, allowing gas to flow from the upper scrubber to the lower for efficient CO2 removal.
SCR Diving certification
Horizon SCR Courses
Learn to dive silent with re:DIVE Singapore. Our SSI-certified instructors train with the Horizon themselves, so you get real-world guidance from setup to open water. Small class sizes, hands-on focus.
Why Train with re:DIVE
Authorised MARES reseller and SSI dive center under one roof. Your training, equipment, and after-course servicing all in one place. We do not just teach it, we dive it.
Pre-requisites
List:
-
Minimum 24 verified/logged dives
-
Deep Diving Specialty certification
-
Enriched Air Nitrox 40 certification
-
-
-
Recreational SCR Course
Max 30m | Non-Decompression | One Gas (1 tank)
Price: S$1,800
Duration: 5 days
Includes:
-
Academic sessions
-
Final exam
-
Equipment configuration session
-
1 pool/confined water skill development session (min. 1 hour underwater)
-
4 open water training dives
-
At least 300 minutes of in-water runtime on the Mares Horizon
-
Training material
-
Certification card
-
Instructor fees
Certification:
The SCR Diving certification entitles the holder to dive with an equally or more qualified buddy, using the equipment configuration and SCR diving procedures from training, to depths of up to 30 metres without decompression stops, in environments similar to those of the diver's training and experience.
XR SCR Course (Add-on)
Max 40m | 25 Min Decompression | Two Gas (1 bottom gas + 1 deco gas)
Price: S$700
Duration: 5 days
Includes:
-
Academic sessions
-
Final exam
-
Equipment configuration session
-
1 pool/confined water skill development session (min. 1 hour underwater)
-
6 open water training dives
-
At least 420 minutes of in-water runtime on the Mares Horizon
-
Training material
-
Certification card
-
Instructor fees
Certification:
The SCR Extended Range certification entitles the holder to dive with an equally or more qualified buddy, using the equipment configuration and SCR diving procedures from training, to depths of up to 40 metres with a maximum of 25 minutes decompression, in environments similar to those of the diver's training and experience.
Upgrading from Recreational to XR
Students upgrading from SCR Diving to SCR Extended Range must complete:
-
All SCR Extended Range academic sessions and assessments
-
SCR Extended Range final exam with a passing score of at least 80%
-
At least 1 additional pool/confined water skill development session (min. 1 hour)
-
Open Water Training Dives 5 and 6
-
At least 120 minutes of open water runtime on the Mares Horizon
-
-
-
Ready to Experience Silent Diving?
Visit re:DIVE today to learn more about the Mares Horizon SCR. Whether you are looking to purchase the unit or enrol in an SSI Recreational or Extended Range SCR course, our team is ready to guide you every step of the way.
Control Your Dive with Precision: Enhance Safety and Performance.
.jpg)
Dive Smart, Dive Safe: Advanced Technology at Your Fingertips.
Dive with Confidence, Dive with Trust
Authorised Reseller in Singapore
SSI Certification
Exclusive Reseller in Singapore
Appointed Dive Center for MediaCorp Channel 8 Series - I Do, Do I?
A.S.S.E.T. Certified Technician For Scuba Equipment Servicing
Member No. T1662
Our vision at re:DIVE is to be recognized as the leading diving school and provider in Singapore, setting the benchmark for excellence, safety, and environmental responsibility in the diving industry. We aspire to create a world where diving is not only an adventure but a journey to inner peace and environmental awareness. Through fostering a deep connection with the ocean, we envision inspiring a global community of divers committed to the preservation and appreciation of our underwater world.