The US Department of Homeland Security's Science and Technology Directorate tested an inflatable tunnel plug to contain flooding or harmful gases. The January test was undertaken in a dummy steel tunnel to see if the plug could hold back 35,000 gallons (159,113.2 litres) of pressurised The five by 10m cylinder was made out of a strong but flexible material comprising three layers: a thick webbing made of Vectran, a liquid crystal polymer; a second, non-webbed layer of Vectran and a third layer of polyurethane. Single-layer plugs failed early, scale model pressure tests.
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机译：美国国土安全部科学技术局对充气隧道塞进行了测试，以检测其中是否含有洪水或有害气体。一月的测试是在一个虚拟的钢隧道中进行的，目的是查看塞子是否能够承受35,000加仑（159,113.2升）的加压。5 x 10m的圆柱体由坚固但柔软的材料制成，包括三层：由Vectran制成的厚织带，液晶聚合物；第二层是非网状的Vectran层，第三层是聚氨酯。单层塞子早期未能通过比例模型压力测试。
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