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The plug’s circumference is sufficiently larger than that of the tunnel to ensure a tight seal even when dealing with the various pipes, vents, lights, and subway tracks that line transit tunnels. The material used to make the plug needed to be pliable enough to conform to the irregular shape of a tunnel, while still being strong enough to hold back a full tunnel’s worth of water. An initial full scale prototype with a single-layer design failed during pressurized testing, with the team ultimately settling on a plug with three separate layers. The outer layer that gives the plug its shape and strength is made up of a thick webbing of a liquid-crystal polymer called Vectran. A second layer of non-webbed Vectran and final layer of polyurethane seal the inflation medium – be it water or air – inside. The plug's designers say relying on commercially available materials for the plug’s construction helped keep development costs down and make them more affordable for mass transit operators.
When deflated, the plug is designed to pack into a small storage space in the tunnel where it can be remotely triggered for immediate inflation by the tunnel’s command center.
Originally posted by CosmicConsciousness
Now I'm not saying that there's a conspiracy behind this invention. But the fact that DHS is involved in the development makes you wonder what other uses this might be applied to. The article states that this would be in use for underground floods in subway systems. But if I were in a situation where I knew SHTF hard, my first thought would be to run underground....like a subway. And I'm sure most of you would do the same. This will create an air tight seal around entrances to underground tunnels, trapping everything in the tunnel.
With all the gloom and doom lately, it could be a possibility, but of course that's just my thoughts on it. I would like to read some input into this.
Link to article