Steam drill drone using offset gears and belts to maximize frontal drilling area, if you can get the drill face to be larger than the craft you can bore holes through ships,
Iran Army Reveals New Kaman-19 Drone in Large-Scale Drill - Caspian News
Addressing the threat of hostile drones to critical infrastructure
US, UK hold naval drone drill in Persian Gulf despite Iran seizures | The Times of Israel
Iranian Army Starts Large-Scale Drone Drill - Caspian News
UAV Stakes Out New Ground - xyHt
Drone Drill
The Drones Are Drilling Holes Now
ROK forces conduct drills against North Korean drones in and around Seoul | NK News
Stealth Drilling Drone Could Help Military – Research at Nebraska
Challenging the West, Iranian Army Launches Drone Drills
Israel Marks Milestones in Drone Warfare With Its First International UAV Drill | The National Interest
Iranian army to hold large-scale drone drill | The Times of Israel
US, UK hold drone drill in Persian Gulf after Iran seizures | AP News
PHOTO GALLERY: Drone drill - Odessa American
Iranian Army to hold large-scale drone drill | Vestnik Kavkaza
Iran conducts first drone on drone combat operation during drill
US in major effort to choke Iran's drone program, end supply to Russia -- NY Times | The Times of Israel
Iran Army stages large-scale military drone drill across country