GNSS-denied operation
Work in underground structures where normal satellite positioning is not available.
Tunnel inspection drone
Inspect tunnel surfaces and difficult sections without GPS.
COAX is a compact inspection platform for tunnels, galleries and underground passages where satellite positioning is unavailable and access can interrupt operations.
Plan a tunnel pilotCOAX + RevSight
Close-range evidence along underground structures
Tunnel inspections may need visual coverage of linings, joints, services, portals and hard-to-reach sections. COAX is being developed to collect inspection data near the structure, while RevSight keeps observations connected to footage and reporting.
Tunnel inspection drone
What a tunnel inspection drone adds
Access difficult viewpoints
Observe elevated, constrained or obstructed areas without relying only on ground-level views.
Faster evidence review
Organize visible findings and their source material for engineering and maintenance teams.
Use cases
Tunnel and underground use cases
The inspection plan should reflect geometry, traffic or operations, airflow, communications and required coverage.
- Road and rail tunnel sections
- Utility galleries and service passages
- Portals, culverts and connecting chambers
- Post-incident or targeted visual assessment
COAX + RevSight
Plan coverage before flight
A defined route and observation list make the captured data easier to use.
Map the task
Define access, route length, target surfaces, operational constraints and communication points.
Capture
Record the agreed tunnel section and areas that are difficult to view from the ground.
Review
Connect observations to evidence and prepare findings for engineering follow-up.
FAQ
Tunnel drone inspection FAQ
Can COAX fly in a tunnel without GPS?
Yes. COAX is designed for confined environments where GNSS/GPS is unavailable.
What tunnel conditions affect a pilot?
Geometry, airflow, dust, moisture, traffic or operations, obstacles, access points and communication range all need to be considered.
Can imagery replace structural testing?
No. Visual evidence can identify areas of interest and support planning, but structural assessment may require measurements, sampling or other specialist methods.
Tunnel inspection pilot
Define a section and the evidence required.
Share the tunnel geometry, access constraints and surfaces your team needs to inspect.