Halcyon began as a group of divers who knew exactly what they wanted but couldn’t find it in any dive store. Our passion for diving gave birth to this company. We started designing wings and lights to satisfy ourselves, but soon discovered that we were not alone in our pursuit of equipment that could stand up to deep wreck and extended cave diving.

Understanding Rebreather Risks

Inherent Risks of Rebreathers

All rebreathers have an inherent risk greater than that found in open circuit scuba. Dive instruction should work to instill respect for the potentially fatal problems associated with rebreather diving, and active rebreather divers must take care not to become complacent.

Rebreather Design History

In the 130 or so years since the first rebreathers were developed, four main design philosophies have come to dominate rebreather construction:

Oxygen Rebreather

A pure oxygen rebreather usually has one supply bottle containing oxygen that is used to replenish what has been metabolized by the diver.

Prior to Halcyon's arrival, two general rebreather operating systems were marketed in various configurations: fully closed circuit rebreathers (CCR) and active addition semi-closed circuit rebreathers (SCR). CCR devices utilize complex electronics to blend mixtures of oxygen with other gasses such as Nitrogen or Helium.

World Record Not Included

Halcyon’s extremely intuitive and reliable, patented RB80™ operating system eliminates distractions and reduces failures that can mean the difference between a mission’s success or failure. The Halcyon rebreather supplies breathing gas as required by the diver’s respiratory rate, providing less oxygen variation and better predictability.

Halcyon Fin Spring Heel

By eliminating the failures common to conventional fin straps, Halcyon spring straps free you from the risk and hassle of lost fins and broken straps.

Stage Bottle Rigging Kit

This simple but elegant solution provides a reliable and streamlined solution for stage/deco bottles.

Doubles Manifold

Halcyon valves and manifolds are rugged and reliable, representing the sort of quality you have come to expect. The Halcyon manifold uses a “radial” seal O-ring; this maintains a seal on the stem and inner diameter of the bonnet nut regardless of valve position.

Even the most casual diver will appreciate the advantages of the Halcyon diver’s notebook.