TunnelGuard is a covert system that uses seismic sensors, buried near the walls or foundations of a structure, to detect tunneling attempts nearby protected assets.

TunnelGuard can recognize the seismic footprint of a variety of activities (digging, drilling, scraping, jack-hammering, etc.), measure their intensity and duration. The proprietary detection algorithms intelligently filter out non-threatening vibrations, from traffic on nearby roads and underground subways, in order to minimize false alarms.


  • Sensitive to digging, drilling, scraping, jackhammering, etc.
  • Filters out city noise (cars, etc.)
  • Sophisticated algorithms provide very high Probability of detection (Pd)
  • Very low False / Nuisance Alarm Rate (FAR / NAR)
  • Easy to install around any building or asset
  • Flexible integration to alarm panels through software or dry contacts



TunnelGuard is a robust and modular solution for detecting any tunneling and digging nearby any infrastructure early enough before the actual breach occurs. It is typically used to protect bank vaults, prisons, museums, and other cultural heritage sites.




The core of the protection system is the TunnelGuard Sensor Unit (TGSU), which consists of a digital signal processor connected to four geophones by shielded cables. The digital signal processor is housed in an IP66 waterproof enclosure that can be installed near the protected structure. The geophones are designed to be installed in variety types of soils.



A typical TunnelGuard system will consist of up to four TGSUs, connected to a Distribution Box – a hub for power and communication. A computer collects the serial data from each TGSU trough the Distribution Box. The computer typically hosts a dedicated SMS (Security Management System) application. Integration to a 3rd party SMS can be done through dry contacts.