飓风桑迪给纽约的公共运输系统带来很大毁坏。为此,国土安全部为了避免未来地铁遭到持续破坏,正在测试巨大的可充气栓塞来密封地下车站避免洪水危害。这种可充气栓塞属于“弹性隧道项目”的一部分,它也能够通过阻挡气体进入或者溢出通道来防御恐怖主义的毒气袭击。这些充气球在理论上相当简单,它们基本上作成隧道通道的样式并且作为临时的封闭。当然这种构造还是有一点复杂,每一个塞子 Hurricane Sandy brought a lot of damage to New York’s public transportation system. To this end, the Department of Homeland Security is testing huge inflatable plugs to seal underground stations from flooding in order to avoid the ongoing destruction of the subway in the future. Such inflatable plugs are part of the “Flexible Tunnel Project” and are also capable of defending against terrorist gas attacks by blocking gas from entering or spilling out of channels. These balloons are theoretically quite simple, they basically make the tunnel tunnel style and as a temporary closure. Of course, this structure is still a bit complicated, every stopper