The infamous US Defense Advanced Research Projects Agency (DARPA) has announced the start of a competition to develop a compact cylindrical container that can instantly scale into protective structures - walls, barricades and barriers, without human assistance. In other words, instant walls that don't require building or assembly.
The project was named BlockADE (Block Access to Deny Entry). The agency suggests that the original container should be about 30 centimeters in diameter, about 2 meters in length and weighing no more than 130 kilograms. Inside the device there will be some material or devices that can instantly expand several times. In this case, the resulting structure must have the necessary properties to block access to the fenced area.
Among the additional criteria for the resulting walls, resistance is also indicated, both from slow mechanical damage, such as hand tools, saws, hammers, axes, and from firearms.