Authorities in the northeastern U.S. investigating flood-barrier technologies to block future flooding in subway tunnels have high hopes for one new device. A pressurized tunnel plug, tested this ...

Twenty years ago in Chicago, a small leak in an unused freight tunnel expanded beneath the Windy City and started a flood which eventually gushed through the entire tunnel system. A quarter-million ...

What’s the best way to plug a giant hole? Why with a giant plug, of course. That’s the thinking of the Department of Homeland Security’s (DHS) Science and Technology Directorate (S&T), which has ...

The US Department of Homeland Security (DHS) has developed a ten-by-five-metre inflatable structure that could be quickly deployed to isolate sections of transit or rail tunnels in the event of ...

Scientists have successfully tested an unprecedented technology for containing flooding or dangerous gases in mass transit tunnels: a giant plug. Twenty years ago in Chicago, a small leak in an unused ...