Halcyon Diver Alert Markers are essential safety gear, providing reliable flotation and visibility during open-water ascents or surface signaling. The Big Closed-Circuit DAM provides 18 kg/40 lb of redundant lift to support diver safety in emergencies.

At 1.4 m/4.5 ft tall, this closed-circuit surface marker remains upright and visible even in challenging conditions. A built-in over-pressure valve and bottom dump allow controlled deployment and venting at the surface.

High-Visibility Surface Marker with Redundant Buoyancy

Whether separated from your team or signaling a surface vessel, this marker ensures you're seen and supported. Trusted by both technical and recreational divers, it's built with Halcyon’s proven durability and thoughtful design.

Specifications

• Easily inflated at depth
• Diver’s Alert Markers use an integrated over-pressure relief valve, allowing them to be deployed from depth
• When deflated, all markers fit in a Halcyon thigh pocket or backplate MC Storage Pak
• Big and Super Big Alert Markers are marked with Coast Guard-approved SOLAS reflective tape
• Halcyon Diver Alert Markers (except semi-closed model) feature our No-Lock® connector for oral inflate or LP hose connection
• Halcyon offers several Diver Alert Markers in your choice of yellow, shocking pink, or orange. These combinations support divers who wish to carry one color to mark their position and one to mark emergencies.

Click here and read our Blog about Surface Marker Buoys!