The Defense Advanced Research Projects Agency (DARPA) is always on the cutting edge of technology, especially when it comes to science fiction-like defense and security devices. The agency has spent a lot of the last decade working on things like robotic suits, brain implants, and even flying cars (which are well overdue). DARPA likes reaching out to the public for our ideas on futuristic technology, too. Recently, DARPA announced it was seeking out ideas for its latest project: a spray can-activated instant wall.
The project is “Block Access to Deny Entry” (BlockADE). What DARPA is looking for is some sort of foam, polymer, or other material that can be compressed and put into a large can about 11 inches in diameter and 78 inches in length. The can should be able to hold around 300 pounds. This material would be released from the can (probably by a spray mechanism) and then build a solid wall that can withstand not just brute human force, but also things like axes, saws, shovels and bullets.
The blockade would be used for things like instantly securing an area, blocking access to a restricted location, or building a blockade to keep people out (or possibly in) a specified area. So basically, DARPA wants something that Wile E. Coyote might try to use against Road Runner. However, the walls could also be used for something like creating temporary shelters for survivors of natural disasters.
So do you have a good idea for BlockADE? If so, DARPA wants you to submit it directly to them via their website.