SALVAGE TESTS 



387 



a. Foam in salvage (FIS) gun ready for foaming 



b. FIS gun ready to load foam 

 in test barrel 



d. Model D stud driver trigger fired, push- 

 button barrel safety, spoil shield and will 

 not fire at more than 8-degree angle 



e. MSA wire cutter for 

 3/4-inch wire rope 



f. Ten-ton velocity- 

 power lift pad 



c. Model D stud driver penetration 

 through HY-80 plate 



g. Ten-ton lift pad with 

 two holding magnets 



Fig. 146. Sealab II salvage tools 



The aircraft hulk was foamed first. Two divers were employed in the foaming process 

 (Fig. 147). The divers commenced foaming at the tail. They then foamed holes in the fuselage's 

 side, and the hulk soon floated free, 10 ft off the bottom, tethered by wire-rope pendants to its 

 cement-clump anchors. Once the hulk floated, the foaming was stopped, even though the quantity 

 of foam delivered (time of application) was much less than had been calculated to be required. 

 This early cessation of foam application proved to be an error which may be attributed to lack 

 of communications and to cold divers, anxious to "go home" to Sealab. 



The foamed aircraft hulk, after several hours, was inspected by surface divers and found 

 to have settled to the bottom. It was, however, found to be "light and lively;" that, is, it was 

 only slightly negatively buoyant. The next day, the aircraft hulk was "foamed" again by Sealab 

 divers. The evolution was essentially the same as the previous day. Again, the hulk floated 



