How deep can the OKM Rover C4 detect and can it locate cavities and voids?

Question: How deep can the OKM Rover C4 detect and can it locate cavities and voids?

Answer: The OKM can reach depths of 21 meters and the detector finds lost treasures such as coins, rings and jewelry as well as cavity structures like tunnels, caves, chambers and graves.

Relevant to: 

• OKM Rover C4