The Guardian Retractable Defensive Barrier system (RDB) is a scalable, dynamic maritime gate and retractable barrier designed for the harshest marine environment. The barrier can be connected to any existing infrastructure (breakwaters, piers, etc.) or other HALO products.

The system uses a modular assembly design that provides quick and easy maintenance. The patented, accordian style structure allows remote opening and closing of the gate system, making the HALO barrier the ultimate port entrance barrier solution.


Performance Specifications
Guardian Retractable Defensive Barrier (RDB)

2.56 m
4.4 m
>6,779 kJ

Height Off Water:
Beam (Width):
Max. Kinetic Energy:


The HALO Guardian Retractable Defensive Barrier (Gate) system is a double wall barrier with diamond shaped segments that form vertical walls in the water. The segments are joined by multiple flexible rubber hinges of a proprietary compound, and walls composed of plastic coated aluminum framework that support the horizontal impact cables.

Guardian expands and contracts through both local and remote automatic operator commands, or semi-automatic commands with manual line connection, or manual backup controls. The gate free-board is approximately 2.5m.

Guardian materials are manufacturer to meet or exceed MIL-STD-810G.

All automation equipment is built to withstand harsh marine environments using standards compatible - COTS components.