Nov 22, 2012
376 notes
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.”

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.”

(via nprfreshair)

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