‘Robots’ specially designed for underwater use, controlled by using a dedicated computer and having any of the following: (a) Systems that control the ‘robot’ using information from sensors which measure force or torque applied to an external object, distance to an external object, or tactile sense between the ‘robot’ and an external object; or (b) The ability to exert a force of 250 N or more or a torque of 250 Nm or more and using titanium-based alloys or ‘composite’‘fibrous or filamentary materials’ in their structural members;