Ch. 4— Technologies for Exploring the Exclusive Economic Zone • 147 



Figure 4-12.— A Tethered, Free-Swimming Remotely Operated Vehicle System 



Sonar 

 console 



Vehicles of this type usually carry one or more closed-circuit television cameras, lights, grabbers, and instruments for monitoring 



and measuring. 



SOURCE: Busby Associates, Inc. 



cate. Comparisons of the relative advantages and 

 disadvantages of manned submersibles and ROVs 

 are difficult to make unless a particular task has 

 been specified and the environment in which it has 

 to operate is known. The first major advantage of 

 a manned vehicle is that the observer has a direct, 



three-dimensional view of the target to be investi- 

 gated or worked on. Second, the manipulative 

 capability of certain types of manned vehicles is su- 

 perior to ROVs. Third, the absence of a drag-pro- 

 ducing cable connecting the manned submersible 

 to its support ship permits the submersible to oper- 



