Ihc lilt was stopped when the lilting ring came up clear of the water and ALVIN was at 

 1 00 Icct. Divers inspected ALVIN and attached her regular lifting bridle, which was suspended 

 from an SS-foot-long, 1-inch wire pendant through MIZAR's center well. 



Di\ers then seciuxd loose and hanging equipment (such as propulsion motors and the 

 manipulator) to ALVIN and commenced rigging lor tow. Because dives at the 100-foot level 

 were rapidly using up the divers' no-decompressi(m dive time, ALVIN was yard-and-stayed 

 alongside MIZAR in order to raise her closer to the surface and haul her to shallow depth. 

 To accomplish this, a 6-inch nylon line was attached to the lifting bridle and the 4'/2-inch lift 

 line was removed. The 4'/2-inch lift line was then rerigged over MIZAR's U-frame to the lift- 

 ing bridle, and the 1-inch wire pendant was removed. (At no time were there less than two 

 lines attached to ALVIN.) ALVIN then was hauled alongside MIZAR to a depth of about 

 30 feet. 



An attempt was made to float ALVIN; however, leaks in the main ballast tanks prevent- 

 ed blowing them dry, and the toggle bar was jammed in the hatch, precluding insertion of the 

 suction hose into the pressure sphere for dewatering. Had ALVIN been floated, she would 

 have been supported in a cradle constructed of the inflatable pontoons, nylon net, and heavy 

 timbers (figure 18). Because ALVIN could not be floated, she was lowered and rigged for sub- 

 merged tow (figure 19). A protective nylon net (figure 20) was rigged around her to prevent 

 accidental loss of any parts while under tow. 



PONTOONS 



NYLON NET 



WRAPPED AROUND 



PONTOONS 



RIGGING TO CINCH 



PONTOONS TIGHTLY 



TOGETHER 



TIMBER PADS TO 



PREVENT PONTOON 



CHAFING 



Figure 18. Sketch of ALVIN Cradle for Surface Tow. 



30 



