Figure 27. ALVIN on Barge — View of Aft Broken Propeller. 



thoroughly planned. A secondary plan must be developed for each phase of the operation, 

 and preparations for its implementation must be as complete as those for the primary plan. 



Rehearsals of all significant phases of an operation should be conducted whenever pos- 

 sible. Such rehearsals can ensure that necessary modifications to the plans are made before 

 the operation begins, and that personnel are thoroughly trained, thus making final perform- 

 ance so smooth as to seem anticlimactic. 



Equipment and systems used for work in the ocean area must be simple and proven if 

 they are to be effective. Use of unnecessarily complex or unproven equipment or techniques 

 should be used only when no other course is open. Action at the air-water interface, such as 

 the attempted reel loading on ALUMINAUT, should be avoided. Such action should take 



38 



