Halcyon - Symbios™ Chest Mount (CM) Rebreather

The Halcyon Symbios™ Chest Mount (CM) Rebreather has officially achieved CE certification in accordance with EN 14143:2013 for closed-circuit rebreathers.

This certification confirms that Symbios meets the rigorous safety, performance, and quality standards required for both recreational and technical diving equipment within the European Union and recognized internationally.

The Symbios CM Rebreather combines Halcyon’s long tradition of innovation with cutting-edge technology:

A modular chest-mounted design for streamlined diving Advanced Guardian r-OS electronics Wireless data transmission and vibration-based alarms for intuitive diver awareness Extended range, enhanced redundancy, and excellent work of breathing in all positions

With CE approval now secured, Symbios is ready to take its place among the world’s most advanced diving systems.

Key Highlights:

• Sleek, ultra-slim design that’s lightweight and unobtrusive

• Transflective color display for excellent readability in all light conditions

• Responsive tactile buttons for confident use underwater

• Rechargeable battery (~40 hours runtime) for extended dive trips

• Clean, easy-to-read interface with customizable layouts

• Numerous customizable parameters to suit diver preference

• Constant evolution with regular firmware upgrades

• Powerful Symbios App integration, extending features and logs

• Scales with a diver’s needs, from recreational to expeditionary use

Built for Modern Divers

• Streamlined Performance: A low-profile chest design that improves trim, comfort, and accessibility.

• Advanced Safety: Dual sensing (electrochemical + GreenFlash™ digital O₂), tactile vibration alarms at the chest, and bold visual alerts for critical conditions.

• Smart Technology: Adaptive setpoint control, Symbios App pairing for pre-dive checklists, firmware updates, and dive log review.

• Exploration Ready: Designed for both recreational and advanced technical dives, fully EN 14143 compliant.

Handset & HUD Integration

Pair the Symbios™ Rebreather with the Handset or HUD for a fully connected experience. Both are part of the unique Symbios ecosystem, delivering intuitive control and critical dive data at a glance.