1. kqedscience:


Plugging Up a Subway Tunnel


“Engineers have developed enormous balloon-like plugs for placement at key points in subway tunnels. Once inflated, the plugs could hold back floodwaters and reduce storm damage.”
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    kqedscience:

    Plugging Up a Subway Tunnel


    “Engineers have developed enormous balloon-like plugs for placement at key points in subway tunnels. Once inflated, the plugs could hold back floodwaters and reduce storm damage.”