NAVY CAPABILITIES 



31 



Z 



The leased Advanced Diving System 

 (ADS IV) Personnel Transfer Capsule be- 

 ing hoisted aboard a Pacific salvage ship, 

 during a series of recent 3 00- ft demon- 

 stration dives off Hawaii. The PTC is fully 

 certified to 600 ft for Navy operations. 



There is a single bottom access trunk, with a double hatch arrangement. 

 The outer hatch seats with external pressure and is designed to swing clear 

 of the flange yoke during mating. The inner hatch seats with internal pres- 

 sure and allows the divers to pressurize the chamber upon reaching the 

 work site, exit, and then return to the surface under pressure. 



Viewports and external lighting provide 360 degree visibility from the 

 PTC. 



Electric power, communication, and television control are suppUed to 

 the PTC through a composite cable. The breathing mixture is surface sup- 

 plied by a separate hose to the PTC. All lifting is accomphshed through 

 use of a separate cable. The communication system incorporates a three- 

 wire design to allow the diver, the PTC occupant, and topside control to 

 be on the same circuit concurrently. 



The outer lock of the DDC is primarily used as an entrance lock pro- 

 viding pressurized entry to or egress from the mated PTC on deck. The 

 lock is large enough to permit medical personnel to enter if the diver needs 

 medical treatment. 



The iimer lock is a chamber providing hfe support for two divers during 

 decompression from dives up to 600 ft in depth. Interior arrangements of 

 the living chambers are based on human-engineering studies previously 

 conducted during the design of chambers for commercial and U. S. Navy 

 use. Each DDC living chamber is provided with heating and air condition- 

 ing, a communication system, and Hfe support equipment. 



