The resolution of a crime occurring more than a kilometer deep in a diamond mine presented an unprecedented challenge: unstable tunnels subjected to extreme geological pressure made safe access for the forensic team impossible. To document the scene without compromising the integrity of the evidence or the lives of the investigators, a remote workflow based on 3D digitization using mobile SLAM and structural modeling was implemented. ⛏️
Technical workflow: capture, georeferencing, and forensic modeling 🖥️
The process began with the GeoSLAM ZEB Horizon, a portable LiDAR scanner that uses Simultaneous Localization and Mapping (SLAM) algorithms to operate in GPS-denied environments. The device traversed the collapsible tunnels, generating a dense point cloud of the gallery and the objects within it. This raw data was imported into Maptek I-Site software, where noise filtering and precise georeferencing were applied to correct distortions caused by ground vibration and high pressure. Finally, the clean point cloud was transferred to 3ds Max. There, a polygonal reconstruction of the scene was performed, integrating models of key elements (mining tools, organic remains) through manual retopology and texture mapping extracted from the scanner images, enabling trajectory and position analysis without stepping into the danger zone.
The value of remote documentation in high-risk environments 🔍
This case demonstrates that SLAM technology and 3D modeling are not just visualization tools, but instruments for preserving the chain of custody. By digitizing an environment that would collapse hours after the scan, the scene was frozen in time. The ability to rotate, measure, and simulate lighting within the model in 3ds Max allowed forensic experts to discover drag marks and dust dispersion patterns that were invisible in the actual tunnel due to darkness and instability, proving that digital mining is the future of criminal investigation in extreme conditions.
How point cloud data captured with GeoSLAM is integrated into 3ds Max to faithfully reconstruct the crime scene under extreme lighting conditions and zero visibility more than a kilometer deep in a diamond mine
(PS: In scene analysis, every scale witness is a small anonymous hero.)