Fig, 14.17 SEA OTTER'S marker buoy (Grimsby Float) is released by rolalmg a handle in thehalch cover wtiich pulls out a restraining pin As the Ileal ascends it reels out the Va-incti 



line which IS spooled around and attached to a 25-ton-capacity cable shackled to the hull The ice tong-like device is slid dov»n the line which is lair-leaded through a hole in the block 



holding the longs open- Reaching the cable, the block is knocked out and the tongs close on the cable. A lilt line attached to the tongs is then employed to retneve the vehicle. 



If the support craft carries no accurate 

 positioning system from which it can ascer- 

 tain its position and relay it to potential 

 rescuers, then more time is lost by the res- 

 cuers in searching for the support craft. And, 

 as we have seen, time is of the essence — for 

 every minute spent cuts into the all-too- 

 short life support. 



External Lights 



Depending on water clarity, a submers- 

 ible's lights (Fig. 14.18) may offer a visual 

 means of homing in on the vehicle once the 

 rescuers have obtained its relative bearing 

 and are within viewing range. In essence, 

 lights are a secondary device to assist res- 

 cue, in that other devices (pingers, marker 



681 



