PURPOSE: To provide submerged working robot control equipment which sharply enlarges the activity range of the robot without increasing consumption power amount and the size of the robot itself.

CONSTITUTION: A relay vehicle 1 with a propulsion machinery having approximately neutral buoyancy is coupled to an antenna 15 protruded from a seal surface W through a cable 13 and incorporates a power source 9. The relay vehicle 1 is coupled to a remote controllable submerged working robot through a cable 11. Communication of control communication data between the submerged working robot 1 and control communicating equipment and materials on a ground or a ship is effected by means of radio wave.