The SeaFox is small enough to be deployed from helicopters and even small rubber boats, but it also can be dropped off the back of a minesweeper. It is controlled by a fiber optic cable and sends live video back to a camera operator.
It can be used against floating or drifting mines, which Iran has used in the past. It operates up to 300 meters deep, and moves at speeds of up to six knots. But the $100,000 weapon is on a what amounts to a suicide mission. The “built-in, large caliber shaped charge” it carries destroys the mine but also the vehicle itself.
http://latimesblogs.latimes.com/world_n ... -iran.html