As part of the approval planning for construction projects, the subsoil must be examined for contamination by explosive ordnance. Ground-based explosive ordnance surveys pose risks for the personnel involved due to hidden explosive ordnance and challenges due to impassable terrain. The use of drone technology enables the subsoil to be surveyed safely and regardless of the terrain – and is 10x faster than conventional methods. Our drones also record metallic and live cables, contaminated sites, archaeology and infrastructure – for extensive preliminary surveys of the surface and subsoil before construction begins.