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Tunnel radio coverage for crews underground.

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Why communication breaks down underground
On site
Signal stops at the tunnel entrance.
Cellular coverage ends the moment teams go underground. No carrier signal, no backup.
Teams on different levels lose contact.
Rock, concrete and tunnel geometry block radio waves between work zones and the surface.
Emergency calls arrive too late.
When contact breaks during an incident, there is no way to coordinate a fast response.
Why standard systems don't work here
Cellular networks
No signal underground. Dead zones for every carrier.
Not reliable underground
Standard walkie-talkies
Limited by line of sight. Tunnel geometry kills range. Signal bounces and fades.
Coverage degrades quickly
Fixed repeater systems
Require permanent installation, power supply and antenna planning. Expensive and slow to deploy on active construction sites.
Slow to deploy on active sites

Not stronger radios.
A network that moves
with the team.

Each LINQRON radio extends the next, forming a relay chain that reaches every level of your tunnel with no fixed infrastructure.

Signal travels hop by hop,
following the team into the tunnel.

SURFACE Supervisor B15 Relay B15 Relay B15 Relay B15P + Location TEAM Underground UP TO 30 RELAY HOPS / SELF-ORGANIZING / NO BASE STATION
30-Level
Relay depth
Minutes
Deploy time, self-organizing
Zero
Fixed infrastructure required
10-500+
Users per deployment
Related guide What Is a Self-Organizing Mesh Radio Network? →
Related guide What Is 30-Hop Mesh Relay? →

Coverage first.
Visibility when needed.

Coverage Layer
B15
Extended Coverage

30-level self-organizing relay. No base station, no fixed repeater. Coverage follows your team wherever they go underground.

30-Level Relay
4800mAh Battery
5W Output
View B15 →
LINQRON B15
Command Layer
B15P
Command & Visibility

When your team is underground and out of sight, knowing where they are matters as much as being able to talk to them. B15P adds GPS and Beidou dual-mode positioning with a 1.38" display, so supervisors can track worker locations in real time, even deep in the tunnel.

GPS + Beidou dual-mode 1.38" color display Individual, group & broadcast calls 30-level relay
View B15P →
LINQRON B15P

Ready to map your system?
Tell us about your tunnel.

The more detail you can share, the faster we can design a relay configuration around your site. Here is what helps most:

Tunnel length and depth Total length, maximum depth, and number of levels or branches
Work zones How many active work faces, and how they move over the project timeline
Team size Number of radio users underground and on the surface
Current dead zones Where communication already breaks down, if known
Location tracking Whether supervisors need to see worker positions in real time
Existing radios Current radio models or frequencies in use, if any need to stay compatible

Plan your tunnel
communication layout.

Tell us your tunnel length, number of levels and team size. We'll suggest a practical deployment approach, with no obligation.

Get a Plan View B15