Guldström - Ground-penetrating radar (GPR) with Drone. If you are serious about metal detecting you will need this, best thing is that is is not a Joke and it is "Made in
Georadar per Drone GPR ᛃ Horus Dynamics
UgCS Airborne GPR Solution | UgCS Integrated Systems
USGS tests drone-based ground-penetrating radar | U.S. Geological Survey