Most drones we know are controlled by their owners from a relatively safe surrounding. An underwater drone would be remote controlled by users from the shore or from a ship/vessel on the water. However, Allec, the new submarine drone being developed by Supportive Robotics, Denmark is rather unique. Allec can be remote controlled, but can also perform autonomous missions.
While this looks fun for now, the uses of Allec could be limitless in the real world, given its inherent flexibility.