2, Windows and Antifouling Devices . Spherical acrylic win- 

 dows, 38 inches in diameter and 4 inches thick, will be 

 installed in the hemispherical end-closures of each 

 cylinder. Each of the windows will have a different 

 operational system for keeping the fouling of the windows 

 to a minimum. These large windows will permit the obser- 

 vation of the interior of lighted concrete hulls without 

 entering the structure. 



IV. Work/Test Subsystem (WBS 2.2500) 



A. Submersible Work Boat. The services of an available under- 

 water work vehicle are required to assist in the construction 

 experiments. The submersible may be used in site survey 

 operations, establishing benchmarks, in-situ soil sampling 

 and tests, in-situ water analysis, site clearing and leveling, 

 turbidity suppression, emplacing and recovering loads, con- 

 trolling other work units, and making structural and mechani- 

 cal connections. 



B. NEMO. NEMO is a tethered underwater system with a spherical 

 acrylic hull that provides panoramic vision. It has a one- 

 atmosphere environment and will function as an in-situ obser- 

 vation, documentation, communication, and control center. 



C. Manipulator Systems. The capabilities and limitations of 

 manipulator systems utilized will be evaluated. One or more 

 manipulators and several tools will be utilized to operate 

 instruments, carry or maneuver loads, operate survey and con- 

 struction equipment, take samples, make connections and operate 

 valves . 



Surface Support Vessels 



A variety of ships will be required to support SEACON from the early 

 site selection phase through the final performance monitoring phase. 



The AGOR (Aiixillary General Ocean ographic Research) type oceanographic 

 research vessel will be siiitable for supporting much of the site survey 

 work. This class of ship is periodically available for use by NOEL. 



Ships of the Ocean Tng .Fleet (ATF) or similar class available from the 

 Fleet would be adequate for performing such operations as establishing moor- 

 ings, performing load-handling experiments and site sioirveys, and placing re- 

 latively small pieces of eq.iaipment such as location markers. The USNS GEAR 

 ARS which is operated under the cognizance of the Navy Supervisor of Sal- 

 vage should be considered as the possible support ship to use dxiring the 

 SEACON construction phase. It is capable of handling relatively large 

 loads and has a fair amount of deck space available for test equipment. 



