Defence barrier also named as defence bastion, defense wall, sand cage, welded gabion box, etc.It is a prefabricated,multi-cellularsystem, made of zinc coated steel welded mesh and lined with non-woven geotextile. Units can be extended and joined using the providedjoining pins. It is easy installed with using minimal manpower and commonly available equipment. After extended,it is filled into sand,stone,then defence barrier like a defence wall or bunker,it is widely used for flood control.

1. Superior Fragmentation Containment
The primary advantage of a blast cage is its ability to trap high-velocity shrapnel and debris. Constructed from high-tensile wire mesh, perforated metal sheets, or composite materials, the cage absorbs kinetic energy and prevents deadly projectiles from escaping, which is the leading cause of casualties in explosions.

2. Pressure and Blast Wave Mitigation
While not a full “bunker,” modern blast cages are engineered with energy-dissipating designs (such as expanding mesh or deformable structures) that reduce peak overpressure. They channel and vent gases in controlled directions, minimizing structural damage to surrounding buildings and equipment.

3. Enhanced Operational Safety
These cages allow for safe handling, inspection, and disposal of unstable or suspicious items (e.g., IEDs, outdated ammunition, or volatile chemicals). They create a stand-off distance without requiring complete evacuation of a facility, significantly improving on-site operator confidence.