ABSTRACT
This chapter deals with ways work is carried out with man working beneath the surface. It takes the position that the most interesting and important of the work is that done by diving. Access to the sea is by means of various diving techniques whereby the worker is exposed to pressure, by submersibles and work stations kept at normal sea level pressure, and by remotely operated equipment and vehicles acting as surrogate workers. Divers use a clever means of moving mud, sand, silt, gravel or any other loose material from the sea floor to another location or to the surface. A variety of techniques are used for inspecting undersea structures, and an intense research effort is continuously underway to find better methods and techniques. Underwater workers can benefit from the assistance of power tools in the same way as any other workers. There are three main types of power source used for these tools: pneumatic, hydraulic, and electric.
