on her sonar. (This ahernative plan was not used, however, as the primary plan was success- 

 ful.) 



Using bathymetric charts previously made (refer to Appendix A), search navigation was 

 considered to be sufficiently accurate to ensure placing the first transponder on the bottom 

 very close to ALVIN, provided there was no excessive current. Should the transponder not 

 be sufficiently close to ALVIN, ALUMINAUT would move it closer. 



Appendix G gives a more detailed account of these navigation plans. 



2. Attachment of Lift Line. Once ALVIN was found, a careful inspection would be 

 made and a report given to surface forces. If her sail hatch was found open, or if found 

 closed and successfully opened with either the magnetic device or ALUMINAUT's manipu- 

 lators, the primary attachment system would consist of a two-legged lifting bridle. Attached 

 to one leg of the bridle was a specially designed toggle for insertion into the pressure sphere 

 hatch. The other leg contained an attaching hook to be fastened to ALVIN's stern lift fitting. 

 The lifting devices are shown in figure 3. 



ALUMINAUT would insert the toggle bar through ALVIN's sail and pressure sphere 

 hatches, trip the latch so that the toggle bar would assume a horizontal position inside the 

 sphere, then lock the toggle bar in position so that it would not pull free and so that vertical 

 motion would be held to a minimum. The stern hook on the other leg of the lifting bridle 

 would then be attached to ALVIN's stern lift fitting. 



Once the attachment to ALVIN was made, ALUMINAUT would surface slowly, paying 

 out the lift line from the reel. After ALUMINAUT surfaced, the bitter end of the lift line 

 would be transferred to MIZAR for handling and recovery. 



Should ALUMINAUT not be successful in attaching the lift line as described above, 

 alternative plans were prepared for both lowering the lift line and for attaching the lift line 

 to ALVIN. The alternative method for lowering the lift line required that the line be trans- 

 ferred to MIZAR for lowering. A full description of this procedure is given in Appendix H. 

 Figure 4 shows the lift line and clump design. ALUMINAUT would then submerge, locate 

 the line and toggle, and insert the toggle for lifting as initially planned. 



If ALVIN's sail and pressure sphere hatches were not open, and could not be opened, a 

 nylon hne wrapped with canvas chafing gear and weighted with shot would be passed around 

 the bow forward of the pressure sphere and frame, through the lifting pad in the after-body, 

 and then married to the main lift line. Recovery would then proceed as in the primary plan. 



3. Lift to Surface. After the lift line had been attached to ALVIN, the bitter end would 

 be rigged through MIZAR's center well and wound onto the traction winch (figure 5). ALU- 

 MINAUT would descend again, staying well clear of the line but keeping it in sight. 



10 



