Because of escalating interest in what is required to accomplish 

 useful work in the ocean environment, questions are being asked about 

 manned submersibles: How do they work? Are there laws that govern 

 their construction and employment? What are they capable of doing? If 

 they are involved in an emergency what can be done to assist them? 

 What are their limitations and their capabilities? Mr. Busby has 

 compiled a comprehensive review of the development and operation of 

 manned submersibles, providing the marine scientist, engineer and 

 surveyor ... as well as the uninitiated explorer of the ocean depths . . . 

 with many answers to questions about these unique vehicles. 



It is the Navy's intent to encourage a wider and more productive 

 exchange of information concerning the requirements for performing 

 useful work in the deep ocean and information about recorded achieve- 

 ments in design and operation of manned submersibles. Mr. Busby's 

 efforts in collecting and presenting the information within the follow- 

 ing pages have contributed greatly to such exchanges among present 

 day and future participants in ocean programs that we all hope will 

 some day deliver, to a waiting world, a realization of the age-old 

 promise of resources from the sea. 



Rear Admiral J. Edward Snyder, 



USN 



Oceanographer of the INavy 



