page 



CONCLUSIONS 68 



NEAR BOTTOM TRANSPORT SYSTEM 



PERFORMANCE CRITERIA 72 



HEAVY-LIFT SUBMERSIBLE 74 



Conceptual Design for a Helium Deballasting Vehicle . ... 76 



Conceptual Design for a Hydrazine Deballasting 



Vehicle 78 



Conceptual Design for a Vehicle With Rigid Lift Tanks ... 79 



Conclusions 79 



HEAVY-LIFT BOTTOM CRAWLER 81 



HYDROCOPTER 82 



Conceptual Design 82 



CONCLUSIONS 86 



CONCLUSIONS 



LIFTING AND LOWERING 88 



POSITIONING AND GUIDANCE 88 



NEAR BOTTOM TRANSPORT 89 



