Mechanization of diving operations is necessary for safer and more efficient underwater construction works in port areas. Teleoperated underwater construction machines are under developing. The detection system as well as the operation one are required for these machines. The problem is that the conventional TV camera system is impractical in water because of turbidity. Haptic information is introduced to help to control construction machines substituting for visual information. In 2003, the experiment of leveling unknown gravel terrain to a certain height using a land model of teleoperated backhoe was carried out. In 2004, the author examined the ability of machine experimentally on a real sea area.　Experimental results show that accuracy of leveling are +17cm±8cm, and the construction efficiency of the system is 25.6m2/h. It is proved that the concept of the authors’ proposed system is enough effective for the operation in such turbid water as visual information is not available, and it has sufficient performance for actual construction works.
　The transportation of heavy materials in water are done by crane vessels. But, it is very difficult that the crane operator confirms divers safety by watching. The technology which can do underwater construction more safely and efficiently is necessary. Operation of the man-machine interface should be easy and intuitive for efficient works when using a remote-controlled underwater excavator. Moreover, operation is preferable to be unwearying. The aim of this research is to evaluate the operability of the joystick-type-interface that is newly proposed. The operability of the joystick and that of the similar-figure-interface were compared in the pointing experiment. As for the pointing experiment, the operation efficiency was evaluated by the speed and the accuracy of the operation of the excavator front part, and the tiredness level was evaluated through the interview with the operators.　As a result, concerning the new interface that uses a joystick, operation efficiency was found to be almost equal to the similar-figure-interface and the tiredness level has been improved. Moreover, the construction material transportation in water was assumed, and the handling experiment was done. The mechanization of the heavy work underwater can be expected by the result of this research.