better resolution, but the present number of 

 exposures attainable (400) is far less than 

 that of the EG&G 35-mm (3,300). 



Ship Salvage (Ref. 48) 



In concept, the salvage of a 95-ton, 51-foot 

 tug (Fig. 11.24) in Howe Strait, B.C. from 670 

 feet was similar to ALUMINAUT's recovery: 

 Lift lines were lowered from the surface 

 instead of reeled up from the bottom. The 

 difference lies in the tools required for the 

 tug salvage by PISCES I. After anchoring a 

 lifting barge with a four-point moor over the 

 sunken tug, a plan was devised whereby 

 PISCES I would cut two anchor chains on 



the tug's bow at the windlass to allow inser- 

 tion of a toggle bar into each of the hawse 

 pipes after the anchor chains slid clear. A 

 sling would then be passed from the bow to 

 the stern of the ship providing fore and aft 

 lines for the required horizontal lift. 

 Whereas no hydraulic chain cutter existed, a 

 blade cutter of 60,000-pound force was made 

 by the owners of PISCES in 5 days to cut the 

 5/8-inch-thick chain. After much difficulty 

 both anchors were removed and one toggle 

 inserted; the second toggle, however, 

 jammed in the hawse pipe. A 65-pound 

 weight was bolted to the manipulator to pro- 

 vide the submersible with a hammering ca- 



Fig 11 24 The 95-ton EMERALD STPAITS Retrieved from 670-loot depth in 1969 with lines attached by International Hydrodynamics P/SCES / (HYCO) 



573 



