Developers say inflatable plugs might have saved some subway ##s from flooding . They are under development as a way to protect people in a terrorist attack . Manufacturer : ` ` We ' ve proved that these devices can hold back water '' Homeland Security : Plug has developed but not ready for use yet .
Developers say inflatable plugs might have saved some subway tunnels from flooding . They are under development as a tool to protect tunnels in a terrorist attack . Manufacturer : `` We 've proved that these plugs can hold back water '' Homeland Security : Plug has promise but not ready for use yet .