The HALO barrier.
The HALO barrier.
Side view.
Side view.

Polymer composite materials are used throughout HALO since they do not pollute the environment. They are also low maintenance as they are not susceptible to degradation in the marine environment.


Valuable coastal assets – including ships, ports, oil/gas terminals, power stations and shoreline buildings – require protection. The HALO floating barrier extends 2.5 m (8 ft) above the water surface, making it impassable to small craft.

For underwater threats, the HALO barrier can be extended below the waterline to prevent physical intrusion by diver or human torpedo using netting suspended from the barrier to the sea bed. Optional automatic diver detection and suppression technologies are also available.

To control larger areas, the HALO barrier may be integrated into a more comprehensive defence system comprised of radars, cameras and unmanned surface vessels (USVs).

How it works

HALO barriers work by transferring kinetic energy to stop a vessel’s forward motion. The barrier, not the boat, is allowed to deform elastically which keeps the reaction forces relatively low. When a boat strikes the barrier face the resulting energy is dissipated between the two barrier rows of the catamaran structure. Thus, by absorbing the energy, the barrier can survive much higher impacts than rigid structures.

The design builds on over a decade of research and uses proven technology in the deployment of wave attenuation to withstand any sea state, and be impervious to the corrosive nature of salt water. Its special Impact Displacement Design not only allows it to handle high impact incidents, but to do so and remain intact, ready to repulse a secondary impact.

NAVDEX 2011 

A full sized section of the HALO Sea Barrier will be on display at NAVDEX 2011 Naval Defence Exhibition in Abu Dhabi on 21-24 February.