17/06/2026
Inspecting tunnels in zero visibility presents a significant challenge. Unknown geometry, confined access and the inability to rely on camera-based inspection make conventional methods ineffective.
During a recent inspection, Deep Dive Division deployed a Boxfish ROV to assess a 163‑metre tunnel in near zero visibility conditions, using imaging sonar for controlled navigation and pipe profiling sonar to capture continuous cross‑sectional data along the full length.
The resulting dataset was reconstructed into a full 3D model, providing a clear representation of tunnel geometry, sediment accumulation and structural condition. Combined with Deep Dive Division’s multidisciplinary expertise, this enabled clear and actionable insight into the asset.
Full case study link in the comments.
Content prepared in collaboration with Deep Dive Division.