SURFACE-SUBSURFACE COMPLEX 29 



provides a rigid platform with overall dimensions of 110 x 90 ft with a 65 x 22 ft open well at 

 one end. The port barge contains an open bay, a portion of which is roofed over and used as a 

 divers' ready room. The DDC was installed in the remainder of the bay. Principal items of 

 machinery included on the support vessel were three ac generators with a total capacity of 

 460 kw, two 15,000-pound-pull winches, a high-pressure air compressor, a low pressure air 

 compressor, and a 100-ton lima crane, restricted to a 50-ton working load as mounted. 



On the starboard barge, 01 level, two vans with a connecting enclosure were installed for 

 use as the Sealab control center. Included in the vans were communications, atmosphere con- 

 trol, and medical monitoring equipment. Other installations included a counterweighted sys- 

 tem for lowering and raising the PTC and Sealab and a breathing-gas storage and distribution 

 system. 



With the aquanauts in the habitat, it was necessary that motion of the support vessel be 

 limited so that any given point would remain within a ten-foot circle. This was accomplished 

 with a five-point moor. Tension in four of the five legs was measured and recorded continu- 

 ously. These data proved to be invaluable in maintaining position without undue strain in any 

 mooring leg. 



