Nothing stops the flow of water from faucets better than a soaking plug. Keeping that concept in mind, Pacific Northwest National Laboratory has come up with a colossal plug that could be used to stop water from entering the subway system in urban areas. Capable of soaking in nearly 35,000 gallons of water at a time, this plug is inflatable and can be deployed quickly.
The Pacific Northwest National Laboratory has joined forces with the Department of Homeland Security, West Virginia University, and spacesuit manufacturer ILC Dover to develop these 32-feet long and 16-feet wide plugs. These can help keep mass transit subway systems safe from terror attacks and floods!