Anytime somebody makes a claim about a drone operating a firearm, you should be extremely skeptical. There's a reason everyone uses explosive drones, not "drone with a machine gun". Small flying machines trying to fire off rounds doesn't work out.
> submarine launched drones throwing incendiary munitions at a flotilla
Per the Greek coastguard, someone left a lit joint by a fuel canister. Maybe the Greeks are in on the deep conspiracy.. or potheads are just forgetful.