Resilient Tunnel Plug

What is the Resilient Tunnel Plug?

The Resilient Tunnel Plug (RTP) is a scalable technology that is intended to plug rail, automotive, or other tunnels from threats, including water. The development system was a 16.2 ft diameter, 32 ft long inflatable structure capable of long term operation of 17psi. It was configured to deploy from a container mounted inside the tunnel. The inflation system pressurizes the plug rapidly and maintains its pressure over its operational life.



The Department of Homeland Security Science & Technology Directorate led the RTP development program which included Pacific Northwest National Laboratory, West Virginia University and ILC Dover. The RTP was originally developed for isolating sections of rail transit tunnels in response to an event such as:

  • Flooding
  • Release of chemical/biological agents
  • Geological
  • Other threats

There are many possible configurations of deployable soft-goods technology, including inflatable plugs, tensioned fabric structures, and hybrid systems. These can be designed to perform water or gas arresting functions in virtually any tunnel architecture, including tunnels, vent shafts, and stairways. Systems can be fixed in place and perform autonomously, or they can be transportable for manual installation.

View this latest news story on our Homeland Security/Flood Protection ribbon cutting ceremony!


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We’ve spent many years studying the science of flood mitigation and the effects flood waters could have on poorly protected infrastructure. In fact, our Certified Floodplain Manager Team is certified to instruct and provide learning credits to Architects, Builders, Certified Floodplain Managers, Code Officials, Engineers, Insurance Agents, Realtors, and Surveyors in many states. Email ceu@dryfloodproofing.com to get started.

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Through our team of world-class engineers and Certified Floodplain Managers, we provide infrastructure flood protection solutions to any design or building throughout the world subject to flooding. Submit your plans to plans@dryfloodproofing.com to get started and receive a complimentary floodproofing layout.