Halcyon Open Circuit SMB

Alert Markers provide maximum visibility and redundant flotation at the surface

Open water divers should always carry a marker buoy they can send up in the event of separation from buddy, primary group, or boat

Open Circuit Alert Marker: 3.8 long, 20 lbs lift

Halcyon Diver Alert Markers (
Inflate at the surface to attract attention
Inflate at depth to send up as a surface marker
All markers are small enough when deflated to fit in a Halcyon thigh pocket or MC Storage Pak
Big and Super Big Alert Markers both come with Coast Guard approved SOLAS reflective tape across the top for improved visibility.
The Semi-Closed Alert Marker has a baffled open bottom for filling with a regulators second stage; all other Halcyon Divers Alert Markers feature closed-circuit (one-way valve) construction.

Picture just for illustration, goods supplied correct to specification

what makes Halcyon different? Simple. To provide the most robust and highest quality diving gear for recreational and technical divers throughout the world, a production line from divers to divers, Halcyon created the DIR Diving System. Professional tools for everyday diving. Halcyon is used by recreational divers the world over for the sheer pleasure of diving with equipment which does not interfere with their enjoyment of the aquatic world. DIR dive systems have made Halcyon the industry's leading brand in simple, safe and affordable gear. Rapid and constant improvements as well as upgrades, added to the outstanding performance, have left the imitation market of inferior copies gasping. DIR divers use only the very best equipment and with Halcyon, you know you are dealing with that: The Very Best. Halcyon believes that every detail makes a difference in the quality of your work and play. And for Halcyon, diving is more than"just another way to spend a weekend".