end to the ring at the upper end of the toggle in ALVIN's sphere. The 4V2-inch lilt line would 

 then be payed out slowly until the load had decreased to 5,000 pounds, indicating that the 

 primary support I'orcc was exerted by the 1-inch wire. 



Actions would then be taken to increase buoyancy and lighten ALVIN. Divers would 

 actuate ALVIN's external solenoids to permit drop-weights to fall free. ALVIN's manipu- 

 lator arm, released by a trip, and the broken after propeller section, to be freed by divers 

 cutting hydraulic hoses, would be recovered in slings lowered from MIZAR. If possible, 

 ALVIN's ballast spheres would be blown dry. 



Safely slings would then be attached to AIA^IN. Divers, after removing the cover plates 

 over the personnel sphere cradle, would pass the slings through and around the cradle strong 

 points. The slings would be shackled into stopper lines from the center well. 



To ensure relocation should a catastrophic failure occur, a 37 kHz pinger would be 

 strapped to ALVIN. Additionally, as a safety backup and to prevent equipment losses, a pre- 

 fabricated nylon web net would be wrapped around ALVIN and made fast to the 4'/2-inch lift 

 line. 



ALVIN would then be rigged with a towing bridle from the fore deck of MIZAR in order 

 to maintain proper towing attitude while underway. 



5. Tow to Shallow Water. MIZAR, with ALVIN in submerged tow, would proceed at 

 approximately 2 knots towards Nantucket Island. This would gain shallow water along the 

 track (after about 45 hours transit time the water depth would be less than 100 feet). Should 

 the weather "make-up" at anytime during tow, the tow course would be altered at the discre- 

 tion of the On-Scene Commander to permit ALVIN to be towed to the nearest sheltered point 

 to Woods Hole. Weather and tow conditions permitting, the maximum distance toward shore 

 would be made prior to any "let-go" decision. 



Once in shallow water, ALVIN would be set down on the bottom. A Hfting rig would 

 be made up using MIZAR's U-frame, and ALVIN would be hfted to the surface. When ALVIN 

 reached the interface the sphere would be dewatered and the ballast blown. She would be 

 placed in a cradle for tow on the surface to Woods Hole. 



6. Final Lift and Salvage. Upon arrival in port, it was planned to remove ALVIN's 

 towing rig, then lift her from the water. As the final salvage phase, measures would be taken 

 to prevent corrosion to ALVIN's components. After delivery to her owner, the Office of 

 Naval Research, the restoration process would begin, and a thorough examination would be 

 conducted to determine the effects of submergence upon her systems. 



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